Tim Kelly joined RL in 2014 as a member of the History Department and serves as Class III Dean. He is a member of the Admission Committee and coach of Third Basketball and Fourth Lacrosse. He holds a B.A. and M.A. from the University of Scranton. He has previously taught at Notre Dame Academy and Monsignor Farrell High School in Staten Island, and was the History Department Chair at Boston College High School.

Lisa Kostur joined RL in 2024 as a member of the Modern Languages and Arts departments as well as RL’s Director of Travel. She teaches French and Class VI Dance, and is choreographer for the Drama Program. She is also a member of the Admissions Committee. She has spent the last several years as a teaching fellow at Harvard in the Department of Romance Languages and Literatures. Prior to this, she was a professional dancer for ten years, performing in over 200 shows throughout Europe. Lisa holds a B.A. in French from Barnard College, a Diplôme d’état in dance pedagogy from the French Ministry of Culture, and both an M.A. and PhD from Harvard.

Mysha Kuhlmann joined Roxbury Latin in 2025 as RL’s first Director of Counseling. Before stepping into this role, she spent four years as Director of Counseling and School Psychologist at Thayer Academy, and before that role, in various capacities in private and public schools in Massachusetts and Texas. Hailing originally from the Lone Star State, Mysha holds a B.S. in Applied Learning and Development from the University of Texas at Austin, an M.A. in Special Education from Loyola Marymount University, and an Ed.S. in School Psychology from the University of Massachusetts, Boston.  

John Lieb began teaching at RL in 1998, and today he serves as Chair of the Mathematics Department. He is a member of the Admissions Committee and coaches Varsity and Third Football and Third Baseball. He holds a B.A. from Williams College and an ALM from Harvard Extension School.

Keri Maguire joined RL in 2016. She currently serves as the school nurse and registrar, teaches Sixie Health and Wellness, and helps with college guidance. She earned a B.A. from Holy Cross and M.S.N. from MGH Institute of Health Professions. Throughout her career she has worked as a nurse practitioner at Assumption College, nurse at South East Toronto Family Health Team, and staff nurse at MGH cardiac surgical step-down unit.

Kerin Maguire joined RL in 2024 as Assistant Director of External Relations. She is also a member of the Community and Culture Committee. Prior to RL she worked in student life at Tufts University; admission and financial aid at the Harvard Kennedy School; and for professional women’s soccer player, Ali Krieger. She holds a B.A. from Dickinson College and M.P.S. from Georgetown University.

George Matthews, Class of 2008, returned to Roxbury Latin in 2013 as a teacher of Classics and English. George attended the College of the Holy Cross, where he was the Rev. William Fitzgerald Scholar. Upon graduating, George was named a Fulbright Scholar, earning his Master’s in Classics while exploring the relationship between Ciceronian forensic oratory and the language of imperial Roman panegyric. His love of language informs his teaching at all levels of our Latin and Ancient Greek programs. In addition to coaching in our soccer and hockey programs, George has served as a Class Dean (for classes II and III) and as the Assistant Director of Admission. George is a member of the Admission Committee and the Community and Culture Committee.

Matt McDonald, Class of 1985, is the Director of Admission and Chair of the Admission Committee. He joined RL in 2021, teaches in the History Department, and is also Head Coach of Varsity Soccer. Prior to RL he worked in admission and financial aid at Choate Rosemary Hall and at Buckingham Browne & Nichols. He holds an A.B from Dartmouth.

Marcus Miller joined RL in 2018 as Director of Digital and Graphic Design. Marcus’s role includes designing the school’s print and digital publications, photographing and filming school life, and maintaining RL’s visual identity and branding. He also teaches a photography course as part of the Arts 8 program. Prior to RL, Marcus held various communications roles at St. Sebastian’s School, Derby Academy, and Catholic Memorial School. He holds a B.A. from Drake University and an M.A. from Emerson College.