Directory

  • Photo of Sean Lissemore
    Sean Lissemore
    Athletic Director
    Appointed in 2019
    214-346-8359
    The College of William and Mary - B.A.
    Indiana University Kelley School of Business - M.S.
    About
     
    After being drafted by the National Football League and playing with the Dallas Cowboys and the San Diego Chargers, Sean Lissemore joined the St. Mark’s administrative team as athletic director in 2019. He earned his bachelor’s degree from the College of William and Mary and his master’s degree from Indiana University. A former collegiate football player at the College of William and Mary, he served as team captain and earned All-American honors. He was drafted into the NFL where he played for seven years, including three with the Dallas Cowboys. Sean founded and organized the Sean Lissemore Youth Football Camp, a free enrichment program for children in Dumont, N.J. and was named the San Diego Charger’s NFL Military Salute to Service nominee. Sean is a member of the National Interscholastic Athletic Administrators Association and is a Certified Athletic Administrator. He also serves as eighth grade class adviser.
  • Photo of Jason Leneau
    Jason Leneau
    Assistant Head of the Upper School; Head Varsity Lacrosse Coach
    Appointed in 2017
    214-346-8109
    University of Virginia - B.S.

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) 346-8117

St. Mark’s School of Texas

10600 Preston Road
Dallas, Texas 75230
214-346-8000

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.