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School Leadership

Portrait of Rabbi Marshall Lesack

Rabbi Marshall Lesack '97

Head of School

Rabbi Lesack is an educational and organizational leader with senior management experience in both the formal and experiential education fields. From 2015 to 2021, he served as the Principal of the Claire and Emanuel G. Rosenblatt High School at Donna Klein Jewish Academy. During his tenure, he led the development of the school’s specialized programs in medicine, engineering, and law, redesigned the Judaic Studies curriculum, and oversaw the growth of student life programming and enrollment in the high school.
In addition to his work in the school environment, Rabbi Lesack previously served as the Assistant Director of Camp Ramah Darom and worked as an educational and organizational consultant for summer camps. An educator at heart, he has taught teenagers and adults in a variety of educational settings over the past 20 years.
Rabbi Lesack is passionate about Jewish day school education and strives to create environments and communities where young people are valued, supported, and able to become the leaders of tomorrow. He was a YOU Lead fellow with Prizmah and completed the Art of Leadership at the Harvard Graduate School of Education. A proud graduate and alumnus of Akiba Hebrew Academy (‘97), Rabbi Lesack holds degrees from Rutgers University and the Jewish Theological Seminary of America, and has also studied at various institutions in Israel.

Christine Farrell

Director of the Middle School

Christine serves as Middle School Director and Department Chair for our Core and Arts programs. As one of our primary educational leaders, she nurtures our Middle School students’ emotional, social, and spiritual growth. She has held several leadership positions at Barrack, including serving as our Dean of Students. She also spent 10 years as an 8th grade core teacher, faculty advisor, and Middle School Council advisor. She holds a B.S. in History from Saint Joseph's University and an M.Ed. from Cabrini College.

Jennifer Groen '91

Assistant Head of School for Strategy

A Barrack alumna and Day School Leadership Training Institute graduate, Jen is proud to serve our school community and help it thrive. Jen was previously Director of Education and Program at Moving Traditions and Assistant Director and Master Teacher at the Jewish Community High School of Gratz College. She was selected as one of the "Top 10 Jewish Influential Leaders Under 50" by Inside magazine and continues to bring her passion and expertise to the field of Jewish education. Jen received her B.A. in Psychology and Religion from Muhlenberg College, attended The Hebrew University, and holds an M.S.W. from Temple University.

Rabbi Judd Kruger Levingston

Director of Jewish Studies


Judd has served as Director of Jewish Studies since 2009. Before coming to Barrack, he taught and held senior administrative posts at the Rebecca and Israel Ivry Prozdor High School at the Jewish Theological Seminary, the Solomon Schechter High School in New York, and at Chestnut Hill Academy in Philadelphia. A Wexner Graduate Fellowship alumnus, he received the 2018 Ettenberg Fellowship for Research in Jewish Education for “The Moral Case for Play” and serves on the Board of Trustees of the Center for Spiritual and Ethical Education (CSEE). He has published widely on moral development and Jewish education and is the author of Sowing the Seeds of Character: The Moral Education of Adolescents in Public and Private Schools. Judd holds a certificate in Chinese Studies from Peking University in Beijing, an A.B. in History and Science from Harvard University, an M.A. in Education followed by rabbinic ordination and a Ph.D. in Jewish Studies from the Jewish Theological Seminary.

Alex Stroker

Chief Operations and Development Officer

Alex has spent nearly 25 years working in the Jewish community in various leadership capacities, including his 5 years at Barrack. He previously served as Chief Marketing Officer, Chief Operating Officer, and Interim Chief Executive Officer at the Jewish Federation of Greater Philadelphia. A graduate of Penn State University, he is responsible for business and finance office oversight, facilities management, transportation, and security. He is also primarily responsible for all annual, short-term, and long-term restricted fundraising efforts. Alex holds a B.S. in Marketing and Advertising from Penn State University.

Rebecca Trajtenberg

Director of the Upper School

Rebecca began her career in education as an admission professional, working at colleges in New York and Pennsylvania before joining Barrack’s College Counseling Office in 2009. She served as its director beginning in 2014 and assumed broader responsibilities as Dean of College Counseling and Student Affairs in 2020. A product of Jewish day school herself, Rebecca is passionate about Jewish education and fostering a community where students are challenged to stretch themselves academically while being supported in their growth as individuals and learners. She earned a B.A. from Muhlenberg College and an M.S. Ed. from the University of Pennsylvania.

Olga Voskoboynik

Director of Finances and Human Resources

Olga serves as Barrack’s Director of Finance and Human Resources after working for more than 25 years as its Controller and Human Resources Director. She has more than 39 years of overall experience in finance, economics, fiscal impact and cost analysis, financial modeling, mergers and acquisitions, and Human Resource management. Her experience includes working in various companies as a Financial and Sustainability Analyst, Mergers and Acquisition Consultant, VP of Finance and Economics, and Director of Finance at KTI Group Inc. Olga holds a Master’s degree from Prague University of Economics and Business.