Directory

After a distinguished career in the military, which included stints as a cannon crewman, a military intelligence officer and several tours in Iraq and Afghanistan, Reyno Arredondo ’87 returned to his alma mater in 2017 as head wrestling coach. He earned his Bachelor of Science degree from the United States Military Academy at West Point and a Master of Arts degree from the University of Texas at Austin. During his military career he taught in the Department of Foreign Languages and Behavioral Sciences and Leadership, as well as serving as an associate athletic director in the Directorate of College Athletics, Army-West Point. At St. Mark’s he is also a physical education teacher for Middle and Upper School students, seventh grade baseball coach, seventh grade adviser and sponsors the Martial Arts Club. He’s an inductee in the Texas Wrestling Hall of Honor and was awarded three Bronze Stars and earned Airborne and Air Assault wings during his military service.

Analisa Rodriguez has served as director of bands since joining the faculty in 2022. She earned her B.M. from Trinity University and an M.Mus. from the University of North Texas. Previously, Rodriguez was an assistant band director at Alamo Heights High School in San Antonio. She is a doctoral student working on a Ph.D. in music education at the University of North Texas, where her research topic is “Music Meets Masculinity: An Ethnography of an All-Boys Band Program.”

Having joined the faculty in 2020, Gregory Bergeron is a member of the Mathematics Department, where he teaches classes in mathematics to seventh graders. He’s a seventh grade adviser and coaches eighth grade volleyball. Bergeron holds a bachelor’s degree from the University of Louisiana-Monroe and a master’s degree in counseling from Amberton University. Prior to joining St. Marks, Bergeron taught for 30 years, including two years in the Ouachita Parish School System in Louisiana, nine years in the Little Cypress-Mauriceville school district in Orange and the last 19 years in the Highland Park ISD. During his time at HPHS, Bergeron taught high school math, coached the women’s soccer team and the Academic Decathlon team.

Ryan Brewer began his St. Mark’s career in 2020 and currently serves as biology and life science teacher as a member of the Science Department. Brewer earned his bachelor’s degree from Morehouse College and a master’s degree in education from the University of North Florida. Before joining St. Mark’s, he taught biology at The Bolles School in Jacksonville, FL and also served as a basketball coach and a member of the residential life staff. Brewer serves as an Upper School class sponsor and coaches JV basketball and Middle School football.

David Brown joined the St. Mark’s faculty in 1999. He earned his Bachelor of Arts degree from Oral Roberts University, a Master of Arts degree from San Diego State University and an MFA from Pennsylvania State University. Before joining St. Mark’s, Brown taught English and served as language arts coordinator for grades 1-12 in the Highland Park Independent School District. After teaching English and serving as the Victor F. White Master Teaching Chair in English, Brown stepped away from the classroom to become the School's first Director of Character & Leadership Education. Additionally, he continues to serve as Director of the St. Mark's Literary Festival. Brown received the Ralph B. Rogers Alumni Award in 2020 and was the Marksmen yearbook dedicatee in 2012. He has twice delivered the Baccalaureate faculty address.

Appointed as the department chair in 2013, Fletcher Carron holds the Stephen M. Seay ‘68 Science Department chair position. He earned a bachelor’s degree in mechanical engineering from Rice University and teaches Upper School and eighth grade students in the field of physical science (physics and chemistry). He began his St. Mark’s career in 2002 and coaches seventh grade basketball, sponsors the Upper School Robotics Team and has served as Pecos Wilderness Trip group leader. A dad to Fletcher Carron ‘32, he is an advisor in the junior-senior advisory rotation. Carron received the John H. Murrell Excellence in Teaching Award in 2008 and was named the Texas Middle School Coach of the Year in 2019-2020.

Elyse Chevallier came to St. Mark’s in 2020 and currently serves as Middle School librarian. She earned a Bachelor of Arts in history and art history from the University of Georgia and a master’s degree in information studies from the University of Texas at Austin. Chevallier is a fifth grade adviser and member of the Association of Independent School Librarians and the Texas Library Association.

Dr. CJ (Chia-Jung) Chiang serves as the president of the Chinese Language Teachers Association of Texas (2022-2024) and is a board member of National Taiwan Normal University Heritage Foundation of North America. She joined the St. Mark’s faculty as a member of the Language Department in 2017, where she teaches classes in Chinese. A St. Mark’s parent (Eli Lin ‘28), she earned her bachelor’s and master’s degrees from National Taiwan Normal University and her doctorate from the University of Texas at Austin. Chiang taught at St. Michael’s Catholic Academy, Fusion Academy, Austin ISD schools and in Taiwan. She serves as a seventh-grade advisor and sponsors the Upper School Yoyo Club and the Middle School Chinese Club.

Coming to the School in 2018, Sarah Choi is a member of the Fine Arts faculty and serves as orchestra director. Choi attended The Juilliard School, Yale University’s School of Music and Boston University’s College of Fine Arts. She is a former faculty member at New England Conservatory’s Preparatory School and the San Francisco Conservatory’s Pre-College Division. Choi has performed with numerous Bay Area orchestras, as a Nashville recording studio musician and the Dallas Opera Orchestra. She is a sixth grade adviser and sponsors the Upper School’s Music for Eternity Club.

Beginning his St. Mark’s career in the Office of Admission, Dean Clayman transitioned to administrative posts in the Middle School office in 2012, first as assistant head. He then was appointed Middle School head in 2017, a position he currently holds. He has a Bachelor of Arts degree from the University of Colorado at Boulder and a Master of Arts degree from California State University-Dominguez Hills. Clayman started teaching as a member of the Teach for America Corps. While in southern California, he taught grades 1, 3 and 4 as well as serving a technology resource teacher and language acquisition specialist. Subsequently, Clayman served as the coordinator of professional development for school districts as well as for the Orange County Department of Education. Upon moving to Texas, Clayman served as a technology teacher, teacher of leadership and director of admission at independent schools in Dallas. He’s the father of two Marksmen, Sam ‘17 and Ben ‘18.

Coming to St. Mark’s in 2022, Anna Crouch is senior associate director of Admission and Financial Aid. She earned a bachelor’s degree from Dickinson College. Prior to joining the School, Crouch was director of Admission at Mercersburg Academy, a college preparatory boarding school. At Mercersburg, she served as dorm parent, class dean, advisor and yoga teacher alongside her admission duties for 11 years. Previously, Crouch worked at a boutique public relations firm specializing in crisis management in Washington, D.C. She serves as a seventh grade adviser.

Beginning her St. Mark’s career in 2015, Valerie Davis is a member of the Mathematics Department, where she teaches mathematics to sixth and seventh graders. Davis earned a bachelor’s degree from Texas Tech University and master’s degree in education from Texas Christian University. Prior to joining St. Mark’s she taught middle school math and science at St. Rita School in Fort Worth. Additionally, she was the math specialist for grades 1-8 in addition to teaching middle school math at The Oakridge School in Arlington. She then moved to California and taught middle school mathematics at the San Domenico School in San Anselmo, CA. She serves as the faculty sponsor for the Middle School MATHCOUNTS team and is a member of the National Council of Teachers of Mathematics. She received the John H. Murrell Excellence in Teaching Award in 2022.

Julie Doerge joined the St. Mark’s faculty in 2006 and is the school nurse. Doerge earned her A.D. from Ferris State University and is a registered nurse (RN). She previously worked ten years at the Hockaday School, six years at the Kingwood School and worked six years overseas in England and Switzerland. Doerge spent two summers working at the Dallas Health and Human Services with Dr. Wendy Chung. She is a member of the National Association of School Nurses and the Texas School Nurse Association. Doerge received both the Ralph B. Rogers Alumni Award and the Marksmen yearbook dedication in 2022.

Returning to his alma mater, Dr. Zachary Erwin ’96 serves as chair of the Language Department, a position he has held since 2018. He teaches classes in Spanish and earned a bachelor’s degree from Emory University. He holds master’s and doctoral degrees from Duke University. Prior to St. Mark’s, Erwin taught Spanish language at Swarthmore College, the University of Texas at Austin and Monmouth College. He sponsors the Sociedad Honoraria Hispánica Spanish Honor Society and is a member of the American Association of Teachers of Spanish and Portuguese and the American Council on the Teaching of Foreign Language.

David Evans joined the St. Mark’s faculty in 2006 as a member of the Language Department, where he teaches Spanish to Middle and Upper School students. He earned a Bachelor of Arts degree from Brigham Young University and a master’s degree in Spanish Peninsular Literature from Brigham Young University. Before coming to St. Mark’s, Evans was a graduate assistant at Brigham Young University. Evans coaches volleyball, serves as an eighth-grade advisor and is a regular participant in the Wilderness Program as a leader of the eighth-grade campout and the Pecos Wilderness trip. In 2023, he received the John H. Murrell Excellence in Teaching Award and is a member of the American Association of Teachers of Spanish and Portuguese. He’s the dad to Grant ‘23.

After earning a B.S. and M.S. in Mechanical Engineering from Stanford University, Kevin worked at a number of energy companies, including Tesla, where he served as lead engineer and designer for the Powerwall and Powerpack battery storage products. He later co-founded Lunar Energy, a company that builds home battery systems. Throughout his career, Kevin has focused on the intersection of art and science, using fabrication skills found in the Makerspace to bring scientific ideas to life. Kevin is also an Eagle Scout, an avid outdoorsman, and the parent of a new ninth grader. 

After playing football at Princeton University, Harry Flaherty spent brief stints with the New Orleans Saints, Tampa Bay Buccaneers and Dallas Cowboys before moving to the University of Tennessee, where he earned a law degree while coaching football in a graduate assistant role for the Volunteers’ football program. Coming to St. Mark’s in 2021, he now serves as head football coach, Upper School history teacher and adviser in the 11th and 12th grade rotations. Before joining St. Mark’s, Flaherty spent six years at The Lawrenceville School in New Jersey, where he served as a history teacher, head varsity football coach, assistant dean of Admission and housemaster for all ninth grade boarding boys.

Janis Oprea joined the St. Mark's School of Texas faculty in 1997 as a middle and upper school mathematics teacher, having previously been the Head of the Mathematics Department at Parkhill Junior High School in Richardson, Texas. A native of Michigan, she received her undergraduate degree from Michigan State University, and continued her education here in Texas, acquiring her Gifted and Talented certification and graduate credits in mathematics from Texas A&M in Commerce and University of Texas in Arlington. In addition to her teaching assignments, Mrs. Oprea also is the Head Coach of the middle school water polo and swimming teams, and is the College Board test site supervisor for the SAT testing program.

As a member of the Language Department since 2011, Anna Gill is an instructor of Spanish in both Middle and Upper School divisions. Before joining St. Mark’s, Gill taught Spanish at the University of Arkansas. She received both bachelor’s and master’s degrees from the University of Arkansas, where she was a member of Phi Beta Kappa. Gill serves as sixth grade class sponsor and adviser and received the Murrell Excellence in Teaching Award in 2015. She is a member of the American Association of Teachers of Spanish and Portuguese.

A member of the Computer Science Department, Ivann Grande joined the St. Mark’s faculty in 2023, teaching classes in Middle and Upper School. Grande earned a bachelor’s degree from Texas Wesleyan University and has taught programming courses at CodewizardsHQ, where he was part of the curriculum development team. He also worked as a software engineer for Tata Consultancy Services where his focus was on web development and applications, simulations, DevOps and virtual reality.

Matt Hjertstedt has been a member of the St. Mark’s community since 2008 and serves as head athletic trainer in the Athletic Department, where he also teaches Middle School physical education and health classes. He earned his Bachelor of Science degree from Central Washington University and Master of Science degree from Texas Tech University Health Sciences Center. He’s also a certified athletic trainer and a licensed athletic trainer. Before joining St. Mark’s, Hjertstedt worked in the fitness industry as a personal trainer and strength coach. A dad to current Marksman Westin ‘31, he also spent time working at Harborview Medical Center in Seattle in the Acute Rehab Unit. Hjertstedt also sponsors an independent studies course in sports medicine for Upper School students and received the John H. Murrell Excellence in Teaching Award in 2014.

After a professional baseball career with the San Diego Padres farm team and the AAA Portland, Oregon Winterhawks, John Hunter came to St. Mark’s in 2008, where he currently serves as Middle School humanities teacher and head varsity baseball coach. Hunter earned his Master of Arts in Humanities degree from the University of Texas at Dallas and a bachelor’s degree in political science from Texas A&M University. After his baseball career, he transitioned to teaching and coaching, working at Arlington Martin High School and Keller High School before joining the Lions’ staff. Hunter is also the eighth grade class sponsor and eighth grade head soccer coach. A St. Mark’s parent (Blake ‘32) he received the Ackerman Character & Leadership Award in 2018.

A Dallas native, Dennis earned a B.A. from Austin College and an M.Ed. from Xavier University and is currently pursuing an M.Hum. from the University of Dallas. Dennis spent several years playing professional baseball overseas and earned Hitter of the Year as part of leagues in Sweden, Australia, France, and Germany. More recently, he has served as a curriculum designer and coach for several local sports development centers and taught fourth and fifth grade at St. Paul Catholic Classical School. Marksmen will also know Dennis from his many years as the Lion’s JV baseball coach.  

A member of the Mathematics Department, Liz Kraft teaches students in grades five and six. Kraft earned her Bachelor of Arts degree from the University of Michigan and a master’s degree from the University of North Texas. Prior to joining St. Mark’s, Kraft taught math and science in the Richardson Independent School District, Parish Episcopal School and Levine Academy. She is a member of the Texas Math and Science Coaches Association and sponsors the Middle School Math Team. She is also a sixth grade class adviser and received the John H. Murrell Excellence in Teaching Award in 2023.

Dr. Michael Lane joined the St. Mark’s faculty in 2023 as holder of the Leonard N. “Doc” Nelson Alumni Master Teaching Chair. Lane earned his bachelor’s degree and Ph.D. from the University of California-Berkeley. Before joining St. Mark’s, Lane worked for 24 years at the College Preparatory School in Oakland, CA, teaching physics, chemistry, astronomy and neuroscience, and coaching a variety of sports. Besides teaching Middle School science classes, Lane is the director of the Winn Science Center Planetarium. In 1991, Lane was the winner of the American Chemical Society (Division of Nuclear Chemistry and Technology) Charles D. Coryell Award in nuclear chemistry.

Jason Lange came to St. Mark’s in 2014 after teaching at the Hong Kong International School in China and serves as assistant head of Middle School and humanities instructor. Lange earned his bachelor’s degree from Tulane University and a master of arts degree from Webster University. A passionate traveler who is a member of the Traveler’s Century Club, he has visited more than 100 countries on all seven continents. Lange began his teaching career at Chaminade College Preparatory School in St. Louis, where he taught sixth grade history and English for ten years. Lange is a sixth grade adviser and the Chartered Organizational Representative for Boy Scout Troop 730. He also sponsors the Middle School Hockey Club and received the John H. Murrell Excellence in Teaching Award in 2016.

Earning a B.A. degree from Shenyang Normal University in China and master’s degree in education from the University of North Texas, Linda Liu joined the St. Mark’s faculty in 2022 as a member of the Language Department and currently serves as Chinese teacher. Before joining St. Mark’s, Liu was a substitute teacher at The Hockaday School. Liu serves as a fifth grade adviser and sponsors the Middle School Chinese Culture Club and is mom to Aiden Guo ‘34. She is the founder of Fun Chinese Class LLC, is a board member of Dallas-Fort Worth Chinese American Story eGarden and is a member of Chinese Language Teachers Association.

A native of South Africa and graduate of Rondebosch Boys’ High School, Bradd Lodge serves as a sixth-grade humanities teacher. Before joining St. Mark’s, Lodge taught history at fellow IBSC schools King Edward VII School and most recently St. John’s College in Johannesburg, South Africa. In addition to serving as a sixth-grade advisor, Lodge is the assistant varsity tennis coach, sponsor of the Middles School Pickleball and Squash clubs and is an active member of the wilderness program. He has a Bachelor of Arts degree from the University of Cape Town and a Postgraduate Diploma in Business Administration from Wits Business School.

A member of the Mathematics Department, Lauren Logan joined the faculty in 2021 and teaches Middle School mathematics courses. She earned her bachelor’s degree from the University of Arizona and her master’s degree from Western Governors University. Before joining St. Mark’s, Logan taught middle school math at neighboring private schools in Dallas and fifth grade all-subjects in San Diego, CA. Logan coaches junior varsity volleyball and co-sponsors the Middle School Community Service program.

A native of Cuba, Corindo Martin began his St. Mark’s career in 1990 teaching mathematics and coaching soccer in the Middle School. Now, he is head soccer coach, winning SPC championships in 2012, 2013 and 2020. Martin holds a bachelor’s degree in mathematical sciences from Southern Methodist University and gained valuable teaching experience while on a teaching fellowship in graduate school at the University of North Texas. He has been involved in youth soccer at both club and recreational levels before his arrival at St. Mark’s. An eighth grade class advisor, he received the Ralph B. Rogers Award in 2006. He’s the father of two Marksmen — Gabe ‘18 and Luke ‘22.

Danielle Maxfield has been teaching at St. Mark’s since 2015 and currently serves as the Humanities Department chair. Maxfield earned her B.A. from Texas Tech University . Previously, Maxfield taught in public school, where she served as a mentor, curriculum coordinator, department chair, coach, grade-level sponsor and faculty adviser. She teaches humanities 8 and graphic design and sponsors the Mini-Marque literary magazine. She received the John H. Murrell Excellence in Teaching Award in 2019.

Cynthia McMahon joined the St. Mark’s faculty in 1990 and currently serves as a fourth-grade humanities teacher. McMahon earned her B.S. and M.Ed. degrees from Stephen F. Austin State University. She taught elementary grades in Nacogdoches, Berkeley, CA and San Francisco before arriving at St. Mark’s. In 1993, McMahon received the Murrell Excellence in Teaching Award.

After 15 years at Ursuline Academy of Dallas, where he taught earth science, chemistry and physics, Dr. Jonathan Moody arrived at St. Mark’s as a chemistry teacher in 2021. Moody coaches Middle School cross-country and track & field, is a freshman adviser and participated as a group leader in the Wilderness Program. He earned his B.S. from Texas A&M University and Ph.D. from UT Southwestern Medical Center. Moody has twice received the Work of Heart award from the Catholic Foundation of Dallas, was named a Regional Coach of the Year in 2021 by the Positive Coaching Alliance and was named the 2017 Texas Cross-Country Coach of the Year by the Lone Star Christian Sports Network.

A member of the St. Mark’s faculty since 1991, Donna Mullett serves as a humanities instructor in the Middle School division. She earned a Bachelor of Arts degree from the University of Massachusetts and a Master of Arts degree from Yale University. Before joining St. Mark’s, Mullett taught English in Japan. She is a fifth-grade adviser and sponsors the Grammar Nerds Club. She received the John H. Murrell Excellence in Teaching Award in 2010.

Dwight Phillips began his St. Mark’s career in 2000 as a member of the Physical Education Department. His previous teaching experience was at Greenhill School in Addison and at All-Saints School of Lubbock. Phillips received his undergraduate degree from Texas Tech University in exercise and sport sciences. While a Red Raider, he was a member of the varsity basketball team. In addition to his teaching duties, he coaches Middle School volleyball, basketball and track & field, and serves as an Upper School advisor. A towering figure on campus, Phillips was named recipient of the Ralph B. Rogers Alumni Award in 2014 and received the dedication of the Marksmen yearbook in 2022.

Dr. Gabriela Reed has been a member of the St. Mark’s community since 2014. She is a licensed clinical psychologist and currently serves as the director of the Marksman Wellness Center. She earned her B.S. from Texas A&M University and Ph.D. from the University of Texas Southwestern Medical Center, where she served as chief resident. Dr. Reed completed her post-doctoral fellowship at Children’s Health and was a psychologist in the Department of Gastroenterology. She developed the Middle School Health and Wellness curriculum and teaches the seventh and eighth grade health and wellness classes.

A Texas native, Ryder grew up in Lubbock and earned a B.F.A. from Texas Tech and an M.F.A. from Texas Christian University. A talented artist, teacher, and gallery director, Ryder’s work has been featured in many exhibitions, including at the Dallas Museum of Art, the Nasher Sculpture Center, and the Roswell Museum. Beyond creating his own art, Ryder has been a visiting artist at St. Mark’s and taught at TCU, Eastfield College, and Richland College, in addition to serving as an adjudicator for the ISAS Fine Arts Festival.  

Dr. Will Roudabush joined St. Mark’s in 2025. He earned a B.A. from Rhodes College (Phi Beta Kappa), an M.A. from the Hudson Strode Program in Renaissance Studies at the University of Alabama, and a Ph.D. from Southern Methodist University, where he taught First-Year Writing, Honors Humanities, Literary Studies, Drama, and British Literature. He has also taught in Bard College’s Language & Thinking Program and studied at Oxford, Venice International University, the California Rare Book School, the Folger Shakespeare Institute, and Shakespeare’s Globe. At St. Mark’s, he advises students in their freshman and sophomore years, co-directs the Literary Festival, and teaches English 9 and English 12 electives. 

Christopher Rutherford arrived at St. Mark’s in 2020 after previously teaching at Harvard-Westlake School in Los Angeles and at Colegio Los Nogales in Bogota, Colombia. He earned his B.A. from Occidental College and an M.A. from Claremont Graduate University. Rutherford teaches humanities, coaches baseball, sponsors the Baseball Club and serves as an eighth grade adviser.

Mark Scheibmeir joined the St. Mark’s faculty in 2022 as a film studies teacher in the Fine Arts Department. He previously served as an arts educator and coach at OTM Acting Studio in Los Angeles and taught at the University of Texas at Austin. Scheibmeir maintains an active role in the entertainment industry as an actor, writer, director and producer. He sponsors the Film Club and serves as a ninth-grade adviser. He earned B.S. and M.F.A. degrees from the University of Texas at Austin. 

Mark Sullivan joined the St. Mark's School of Texas faculty in 1982 as the Lower School Physical Education Coordinator. Prior to his appointment as the Director of Athletics and Physical Education in 2000, Mark has served the school as the Wilderness Program Director, the Assistant Head of the Middle School and as a coach and teacher in the Athletic Department. Mark holds a Bachelor of Science Degree and a Masters Degree in Educational Administration from the University of North Texas, and is a recipient of the John H. Murrell Excellence in Teaching Award. Mark's coaching has included numerous Middle School sports as well as the Varsity Volleyball team and the Varsity Diving team.

After a collegiate coaching career at Mary Hardin-Baylor University, Darren Teicher joined the St. Mark’s faculty in 2008 where he serves as head volleyball coach. He earned a bachelor of science degree from the University of Mary Hardin-Baylor, where he won a national championship as a player. As a coach here, his teams have won seven SPC volleyball championships.

Kurt joined St. Mark’s in 2012 and teaches middle and upper school computer science. He also coaches middle school basketball and JV lacrosse. Before coming to St. Mark’s he worked at independent day schools in Cincinnati and Connecticut. Kurt has many roles on campus outside the classroom and coaching including advisor, club sponsor and is also an active member of the wilderness program. A native of Cincinnati and graduate of St. Xavier High School, Kurt received a B.S. in Business from Miami University. He and his wife have two children.

After a collegiate coaching career, John Turek came to St. Mark’s in 1996, where he is head coach of the track and field program. He also was cross country head coach for 26 years here, and now assists with those athletes. He has a bachelor’s degree in criminal justice from California State University-Los Angeles and a master’s degree in physical education from California State UniversityFullerton. His collegiate coaching career includes cross country and track and field head coach at California State University-Los Angeles and physical education teacher, women’s cross country and track and field head coach at California State Polytechnic University-Pomona. He also serves as an advisor in the ninth and tenth grade class rotations.

Katherine Wood serves as Middle and Upper School art teacher. Coming to St. Mark’s in 2019, she earned a B.F.A. from the University of North Texas and an M.A. and M.F.A. from the University of Dallas. Previously, Wood taught at the University of North Texas, the University of Dallas, the University of Texas at Arlington and Mountain View College. She is a sixth grade adviser and Upper School Creative Arts Club sponsor. Wood’s studio practice consists of 2D work that interprets expansive hypothetical spaces, inspired by mathematical theories, physical infrastructure and nature. Her work has been shown at dozens of exhibitions.