Leadership that delivers

As President and CEO of Combined Jewish Philanthropies of Greater Boston (CJP), Marc leads the organization in its mission to inspire Jewish life and ignite positive change in Greater Boston, in Israel, and across the globe. He champions CJP’s efforts to build partnerships, develop resources, mobilize volunteers, and put innovative philanthropy into practice. Marc regularly writes, speaks, and teaches about leadership, community, and civic life, bringing the voice of Jewish tradition to contemporary issues. Marc graduated from Yale University in 1997 with a Bachelor of Arts in religious studies and received his Master’s in Jewish education from The Hebrew University in 2002. Before coming to CJP, Marc served as head of school at Gann Academy in Waltham. Born in Lynnfield, Marc currently resides in Brookline with his wife, Jill, and they have four children.

Aron Ain is Board Chair at UKG and former CEO, where he led the company’s growth into a global enterprise. A longtime Jewish communal leader, he has been deeply involved with CJP as a board member, campaign chair, and leadership program alum. Aron also serves as an operating partner at Hellman & Friedman and is active with multiple civic and healthcare institutions.

Matthew Sidman is Managing Partner and Chief Investment Officer of Three Bays Capital. With a background in investment management and finance, he has held leadership roles at top firms and brings strategic financial expertise to his work with CJP, including serving on key committees and supporting major philanthropic initiatives.

Michelle Black is a nonprofit leader and strategic advisor focused on strengthening Jewish community organizations. A co-founder of TribeTalk and former board chair at Gann Academy, she brings expertise in leadership development, governance, and community engagement through her work across education and nonprofit institutions.