• Photo of Korey Mack
    Korey Mack
    Admission Officer
    Appointed in 2016
    Texas A&M University - Commerce - B.A.A.S.
    Texas A&M University - Commerce - M.S.
    A graduate of St. Mark’s, Class of 2000, Korey Mack serves as Admission officer in the Office of Admission. He earned both bachelor’s and master’s degrees from Texas A&M-Commerce (applied arts and sciences). Before coming home to St. Mark’s, he served as teacher and administrator at Life Charter School, Williams Preparatory School and Uplift Education. At St. Mark’s, Mack serves as an eighth grade class adviser, coaches junior varsity football and sponsors the Student Ambassador Club and the Lion & Sword Society. He also served on the City of Dallas Planning and Zoning Commission from January 2017 through September 2018.
  • Photo of Seth Magill
    Seth Magill
    Middle School Drama Teacher
    Appointed in 2020
    Southern Methodist University - B.F.A.
    Seth Magill has been teaching Middle School drama at St. Mark’s since 2020. He earned his B.F.A. from Southern Methodist University. Magill previously taught and directed theater at Cistercian Preparatory School, Dallas Children’s Theater and Shakespeare Dallas. He has performed onstage for many local theaters, including the Dallas Theater Center, Dallas Children’s Theater, Water Tower Theatre, Theatre Three, Kitchen Dog Theater and Shakespeare Dallas, where he played Hamlet. In addition to his teaching responsibilities, Magill serves as a fifth-grade advisor and is the technical theater director for Middle and Upper School drama productions.
  • Photo of Katherine Magruder
    Katherine Magruder
    Humanities Teacher
    Appointed in 2019
    Johns Hopkins University - B.M.
    New York University - Ph.D.
    A member of the St. Mark’s faculty since 2019, Dr. Katherine Magruder is a member of the Humanities Department. She earned her bachelor of music from Johns Hopkins University and a Ph.D. from New York University. Magruder previously taught in the history departments of the Dalton School and Spence School in New York City. She also taught undergraduate courses at Barnard College, New York University, Sterling College and the New School. Her academic writing appears in several journals and edited book collections. Magruder coaches the Middle School Quiz Bowl Team, serves in the Wilderness Program and is a sixth-grade adviser. She is also the director of the Robert E. Dennard and Willard E. Walker ‘66 Visiting Scholars Programs.
  • Photo of Hossam Mahmoud
    Hossam Mahmoud
    Fencing Coach
    Appointed in 2014
  • Photo of Timothy Mahoney
    Tim Mahoney
    Director of Debate
    Appointed in 2000
    University of Kansas - B.G.S.
    Tim Mahoney joined the St. Mark’s faculty in 1999 and directs the School’s debate program. Father to Dalton ‘31, Mahoney earned his B.G.S. from University of Kansas. He previously served as director of forensics at University of Notre Dame, was an executive board member of the National Debate Coaches Association Tournament and director of the National Debate Coaches Association National Championships.
  • Photo of John Mallick
    Jack Mallick
    Ahlberg & Ribman Family Director of Alumni Relations
    Appointed in 2018
    Texas Christian University - B.S.
    A graduate of St. Mark’s, Jack Mallick ’14 returned home as a member of the Office of Development & Alumni Relations in 2018. Mallick earned his B.S. from Texas Christian University. He holds an endowed faculty position as the Ahlberg & Ribman Family Director of Alumni Relations, as well as the sponsor of the Student Alumni Association. He received the Superior Staff Award in 2022 and serves as an admission liaison.
  • Photo of Kathryn Mallick
    Kathy Mallick
    Lower School Administrative Assistant
    Appointed in 2016
    Kathy Mallick joined the St. Mark’s staff in 2016 as administrative assistant in the Lower School. She earned a bachelor’s degree in early childhood education from California State University-Los Angeles. Mallick is the mom to four Marksmen — Sam ’10, Joe ’11, Jack ’14 and Will ’20 — and served as Parents’ Association president in 2015-2016.
  • Photo of Nancy Marmion
    Nancy Marmion
    J.J. Connolly Master Teaching Chair
    Appointed in 1985
    College of William and Mary - A.B.
    University of Texas at Austin - M.A.
    Nancy Marmion came to St. Mark’s in 1985 from The Hockaday School, where she taught Spanish. She served as chair of the Language Department from 1994 to 2018. Marmion currently holds the J.J. Connolly Master Teaching Chair, as well as serving as the faculty chair of the Discipline Council, Spanish Club sponsor and co-sponsor of International Week. She earned her A.B. from the College of William and Mary and M.A. from the University of Texas at Austin. She received the John H. Murrell Excellence in Teaching Award in 1989. Marmion is a member of American Council on the Teaching of Foreign Languages (ACTFL) and the American Association of Teachers of Spanish and Portuguese (AATSP). In 2018, she received the Life-Long Service Award from the Lone Star Chapter of the AATSP.
  • Photo of Corindo Martin
    Cory Martin
    Mathematics Dept. Faculty; Head Soccer Coach
    Appointed in 1990
    Southern Methodist University - B.S.
    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.
  • Photo of Kineta Massey
    Kineta Massey
    Lower School Drama Teacher
    Appointed in 2022
    After teaching theater around Dallas-Fort Worth for 22 years, Kineta Massey joined the St. Mark’s faculty in 2023. She attended Los Angeles City College Theater Academy and has worked with Dallas Children’s Theater, Big Thought, Bath House Cultural Center and City of Dallas Office of Cultural Affairs. She has also taught in the Dallas Independent School District and toured with Missoula Children’s Theater. Massey currently serves as the Lower School drama teacher.
  • Photo of Daniel Mauch
    Daniel Mauch
    Security Guard
    Appointed in 1997
  • Photo of Danielle Maxfield
    Danielle Maxfield
    Humanities Department Chair
    Appointed in 2015
    Texas Tech University - B.A.
    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.
  • Photo of Shane May
    Shane May
    Thomas B. Walker III ’73 Mathematics Department Chair
    Appointed in 2019
    University of Houston - B.S.
    Houston Baptist University - M.Ed.
    As chair of the Mathematics Department, Shane May serves as the Thomas B. Walker III ‘73 Mathematics Department Chair. A member of the faculty since 2019, he also co-chairs the Quiz Bowl. May earned his B.S. in mathematics from the University of Houston and a M.Ed. from Houston Christian University. He previously taught for 24 years in the Deer Park Independent School District, where he served as the Mathematics Department chair, Science Department chair and head coach of the Academic Decathlon team. May has received the RadioShack National Teaching Award, Texas Exes Teaching Award and was inducted into the Deer Park ISD Hall of Honor.
  • Photo of Stewart Mayer
    Stewart Mayer
    Makerspace Director
    Appointed in 2019
    Southern Methodist University - B.A.
  • Photo of Tracey McKenzie
    Tracey McKenzie
    Third Grade Teacher
    Appointed in 2021
    Texas Southern University - B.A.
    American Intercontinental University - M.A.
    Before joining St. Mark’s in 2021, Tracey McKenzie taught humanities and served as team leader at the Greenhill School for 19 years. She also taught in Dallas ISD and Cedar Hill ISD, and spent several years working with the Future Leaders Program on the St. Mark’s campus, which works with public school students taught by independent schoolteachers in the Dallas area since 1998. She has a bachelor’s degree from Texas Southern University and a Master’s of Education degree from American Intercontinental University. At St. Mark’s, she serves as third grade teacher and adviser/phase leader.
  • Photo of Cynthia McMahon
    Cindee McMahon
    Fourth-Grade Humanities Teacher
    Appointed in 2017
    Stephen F. Austin State University - B.S.
    Stephen F. Austin State University - M.Ed.
    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.
  • Photo of John Mead
    John Mead
    Eugene McDermott Master Teaching Chair in Science
    Appointed in 1990
    Duke University - B.A.
    Duke University - M.A.T.
    Holding the Eugene McDermott Master Teaching Chair in Science, John Mead joined the St. Mark’s faculty in the fall of 1990. He earned his bachelor’s and master’s degrees from Duke University, where he maintains a fierce loyalty to the Blue Devils’ basketball team. Having previously served as the sixth grade class sponsor and assistant head of Middle School, Mead now teaches sections of life science to sixth graders. Since the 1990’s, Mead has been one of the leaders of the School’s Wilderness Program, guiding Marksmen through the outdoors on dozens of Middle School campouts and Pecos Wilderness Trips. Mead has also traveled across the globe with scientific research teams from Peru’s Boiling River to the Rising Star Cave in South Africa. Through his friendship with world-renown paleoanthropologist Dr. Lee Berger, Mead has facilitated in-person visits and live video calls with the research team excavating fossils of the early hominin homo naledi in Africa. He has earned recognition from the National Association of Biology Teachers, including the Outstanding Biology Teacher Award for the state in 2018 and the Evolution Education Award in 2019.
  • Photo of Lola Miller
    Lola Miller
    Senior Food Service Director
    Appointed in 2019
  • Photo of David Mitchell
    David Mitchell
    Senior Maintenance Engineer
    Appointed in 2008
  • Photo of Kristin Mlakar
    Kristin Mlakar
    Project Manager
    Appointed in 2012
    With both bachelor’s and master’s degrees in architecture from the University of Texas at Arlington, Kristin Mlakar is project manager in the Business Office. Before coming to St. Mark’s in 2012, she worked for an architecture firm. She received the Superior Staff Performance Award in 2014.
  • Photo of Paul Mlakar
    Paul Mlakar
    Director of Academic Information Systems; Math Department
    Appointed in 2003
    Ohio State University - B.S.
    University of Houston - M.A.
    Paul Mlakar is the director of Academic Information Systems and a member of the Mathematics Department, where he teaches AP calculus courses to junior and senior students. Beginning his St. Mark’s career in 2003, he also serves as scheduler for Upper and Middle Schools and coaches the Upper School Academic Quiz Bowl team. He earned a Master of Education degree in curriculum and instruction from the University of Houston after earning a Bachelor of Science degree in mathematics education from The Ohio State University. Mlakar has worked in various aspects of education throughout his career, first as a high school math teacher in Pasadena, TX followed by an education specialist position at the Space Center in Houston, the visitor center for NASA’s Johnson Space Center. He left that position to serve as an education specialist at the Region IV Education Service Center in Houston, where he provided training and professional development to math teachers. He has authored numerous mathematics curricula for geometry, algebra II, and mathematical modeling.
  • Photo of Catherine Montgomery
    Kaysie Montgomery
    Student Store
    Appointed in 2018
  • Photo of Jonathan  Moody
    Jonathan Moody
    Chemistry Teacher
    Appointed in 2021
    UT Southwestern Medical Center - PhD
    Texas A&M University - BS
    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.
  • Photo of Scott Moore
    Scott Moore
    Associate Director of Communications
    Appointed in 2020
    Stephen F. Austin State University - B.S.
    University of North Texas - B.F.A.
    Scott Moore arrived at St. Mark’s in 2020 and serves as associate director of Communications. He earned a B.S. degree from Stephen F. Austin State University and a B.F.A. degree from the University of North Texas. Before joining St. Mark’s, Moore worked as a designer and art director for several design and marketing firms, including his own agency. He serves in the Army Reserves as an instructor after having been deployed to Iraq and Afghanistan. Moore participates in the St. Mark’s Wilderness Program as a group leader.
  • Photo of Anna Morris
    Anna Morris
    Development Office Coordinator
    Appointed in 2000
  • Photo of Michael Morris
    Michael Morris
    English Department Chair
    Appointed in 2014
    Williams College - B.A.
    Columbia University - M.A.
    Michael Morris began his St. Mark’s career in 2014 and currently serves as English Department chair. Morris earned his B.A. from Williams College and M.A. from Columbia University. Before joining the St. Mark’s faculty, he taught and led the English Department at Vail Mountain School in Colorado and Western Reserve Academy in Ohio. Morris teaches freshman English and advises students in their junior and senior years. He has engaged in professional development through the National Endowment for the Humanities, the College Board and the Klingenstein Center for Independent School Leadership.
  • Photo of Susan Morris
    Susan Morris
    Second-Grade Teacher
    Appointed in 2010
    University of Texas at Austin - B.S.
    University of Richmond - M.L.A.
    A member of the Lower School faculty since 2010, Susan Morris currently serves as a second-grade teacher. Prior to teaching math, language arts and social studies at St. Mark’s, she spent more than 30 years serving as a second-grade teacher at The Hockaday School and a third-grade teacher at The Collegiate School in Richmond, Virginia. Morris earned her B.S. from the University of Texas and an M.L.A. from University of Richmond.
  • Photo of Rachel Muldez
    Rachel Muldez
    Industrial Arts Teacher
    Appointed in 2022
    Baylor - BA
    University of Houston Clear-Lake - MA
    University of Dallas - MA
    University of Dallas - MFA
    Named one of the best ceramicists by D Magazine, Rachel Muldez came to St. Mark’s in 2022 and is a member of the Fine Arts faculty, teaching courses in wood and metal and 3-D design. She has a bachelor’s degree from Baylor University and two master’s degrees (University of Houston-Clear Lake and University of Dallas). Before coming to St. Mark’s, Muldez taught ceramics at Dallas College-Richland and was also a full-time artist and public speaker. She is a seventh-grade adviser and a co-sponsor of the Nature Conservatory Club. She has had her artwork collected and displayed on several occasions at the National Hispanic Cultural Center Museum. Her work has also been exhibited in many galleries including the gallery located in the governor of New Mexico’s office.
  • Photo of Donna Mullett
    Donna Mullett
    Humanities 5
    Appointed in 1991
    University of Massachusetts Amherst - B.A.
    Yale University - M.A.
    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.
  • Photo of Katelyn Muñoz
    Katelyn Muñoz
    Director of the St. Mark's Fund
    Appointed in 2021
    Southern Methodist University - B.A.
    Southern Methodist University - M.B.E.
    A member of the St. Mark’s Office of Development and Alumni Relations since 2021, Katelyn Muñoz serves as director of the St. Mark’s Fund. Muñoz earned her B.A. and M.B.E. from Southern Methodist University and began her career as a Dallas Independent School District bilingual teacher through Teach For America (TFA). After working as a leadership development coach for the organization, Muñoz led TFA-DFW’s first-ever annual giving program.
  • Photo of Alicia Muratalla
    Alicia Muratalla
    Food Services Staff
    Appointed in 2001
  • Photo of Jose Muratalla
    Jose Muratalla
    Maintenance Staff
    Appointed in 1991
  • Photo of Kendall Murphy
    Kendall Murphy
    Computer Science Teacher, Coordinator For Instructional Technology and Fifth-Grade Sponsor.
    Appointed in 2015
    Texas Christian University - B.S.
    In 2015, Kendall Murphy joined the St. Mark’s faculty as a computer science teacher. She also serves as coordinator for instructional technology, fifth-grade sponsor and tennis coach. After earning her B.S. from Texas Christian University, Murphy began her career as a teacher at R.L. Turner High School, where she was also the varsity and junior varsity tennis coach. Murphy teaches a variety of business, marketing and computer science courses. She received the John H. Murrell Excellence in Teaching Award in 2018 and the Ackerman Character Education Award 2020.
  • Photo of Audrey  Murray
    Audrey Murray
    Latin Teacher
    Appointed in 2019
    University of Dallas - B.A.
    University of Texas at Dallas - M.A.

St. Mark’s School of Texas

10600 Preston Road
Dallas, TX 75230

Main School Number
(214) 346-8000

Upper School Office
(214) 346-8107

Middle School Office
(214) 346-8103

Lower School Office
(214) 346-8210

Admission Office
(214) 346-8700

Development Office
(214) 346-8800

Business Office
(214) 346-8118

St. Mark’s School of Texas

10600 Preston Road
Dallas, Texas 75230

About Us

St. Mark’s School of Texas is a private, nonsectarian college-preparatory boys’ day school for students in grades 1 through 12, located in Dallas, Texas. St. Mark’s aims to prepare young men to assume leadership and responsibility in a competitive and changing world.

St. Mark’s does not discriminate in the administration of its admission and education policies on the basis of race, color, religion, sexual orientation, or national or ethnic origin.