David Fisher came to St. Mark’s in 2016 as chair of the History and Social Sciences Department after a more than 25-year career on the international school circuit. Prior to coming here, he taught in Malaysia, Argentina, the Phillipines, Oman and Bangladesh. He holds a master’s degree from the University of Cambridge and a bachelor’s degree from Harvard University. Fisher, whose son Nathaniel graduated from here in 2023, has previously worked as an academic dean, department head and college counselor.

The Rev. Dr. Stephen Kirkpatrick Arbogast serves as the school chaplain here. Arbogast, formerly a vice-president with Goldman Sachs, joined the Peace Corps to teach at the Institut National d’Économie, (I.N.E.) Université Nationale du Bénin in the République du Bénin. First a Jesuit and now an Episcopal priest, Arbogast’s taught everyone from pre-school children to retired adults: with the Groton School, Trinity School (NYC) and the National Cathedral School as well as with several Jesuit schools, including Georgetown Prep, Fordham Prep and the Loyola-Blakefield School. He’s also served in parishes such as Trinity Church Wall Street and St. Paul’s Chapel at Ground Zero. His research interests have long been to understand the relationship between religion and education with a focus on spiritual and ethical formation. He holds degrees from Yale, Harvard and the Perkins School of Theology (Southern Methodist University).

Before joining St. Mark’s, Bryan Boucher taught and coached for 14 years in several public schools in Connecticut, Georgia and Texas. A member of the History and Social Sciences Department, he teaches classes in AP U.S. history and AP microeconomics, and is co-sponsor in the junior and senior class advisory rotations. After receiving his bachelor’s degree from Connecticut College, he completed a two year fellowship program with the United States Golf Association before beginning his career as an educator. With a master’s degree from the University of North Texas, he has been awarded the Ackerman Character Education Award at St. Mark’s in 2021 and was recognized as an “Outstanding Educator” from the University of Chicago, based on student recommendations. Boucher has served as an AP reader for various subjects since 2011 and previously worked as an AP regional consultant.

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.

Dr. Andrea Hamilton has been a member of the St. Mark’s community since 2019 and is a faculty member in the Department of History and Social Sciences. She teaches courses in history of American society, foundations of world societies and AP U.S. history. A mom to Miller Wendorf ‘24, she earned a doctorate from Tulane University and holds undergraduate degrees from Indiana University and Southern Methodist University. Prior to St. Mark’s she taught a variety of history and English classes at Southern Methodist University. Hamilton sponsors the St. Mark’s chapter of Junior World Affairs Council and travels with the School’s Model United Nations team.

In his position as director of Civic Responsibility, Dr. John Perryman is a member of both the History and Social Sciences Department and the English Department where he teaches courses in sophomore English, AP history and the highly popular senior elective, “A 100-year partnership: A history of St. Mark’s and the City of Dallas.” He joined the School in 2009 and previously served as assistant head of the Upper School. He earned a bachelor’s degree from Williams College and both a master’s degree and a doctorate from the University of Texas at Dallas. He was the recipient of the Marksmen yearbook dedication in 2016.

Michele Santosuosso has served as a history teacher in the Department of History and Social Sciences since joining the St. Mark’s faculty in 2015. Mom to two Marksmen — Jacob ‘29 and Kane ‘32 — she advises multiple clubs and is the sponsor of the Upper School Student Council and co-sponsor for the ninth and tenth-grade class rotation. Previously, Santosuosso taught at Williams High School in

Dr. Bruce Westrate has been a member of the St. Mark’s faculty since 2003 and serves as a history teacher, holding the Nancy and Jeffrey Marcus Master Teaching Chair. He earned a B.A., M.A. and Ph.D. from the University of Michigan. Dr. Westrate previously taught at Lake Michigan College, Purdue University, Western Michigan University and Indiana University. He has authored several books and has been published in multiple articles, including “Rediscovering the British Empire,” “The Arab Bureau” and “Apotheosis,” among others. Westrate was the 2017 Marksmen yearbook dedicatee.