Stephen Berenson

Managing Partner at Flagship Pioneering

Stephen Berenson is a managing partner at Flagship Pioneering and a member of the firm’s Resource Allocation and Management Committees. He focuses on capital formation at the fund and portfolio company levels and value growth after our companies spin out of the Flagship enterprise. Stephen also drives strategic and operational improvements across the firm and its portfolio of companies, and helps deepen relationships with critical, external partners. He is on the board of directors at Moderna (NASDAQ: MRNA), CiBO Technologies, and Seres Therapeutics (NASDAQ: MCRB).

Stephen joined Flagship after a 33-year career as an investment banker at J.P. Morgan. During that time, he worked across all major geographies, product areas and industry groups, and helped build the bank’s M&A, equities and technology investment banking businesses. During his last twelve years at J.P. Morgan, Stephen was vice chairman of investment banking and focused on providing high-touch strategic advice and complex transaction execution to leading companies across all industries globally. He was co-founder of J.P Morgan’s Global Strategic Advisory Council and co-founder of the firm’s Board Initiative. During Stephen’s leadership of the Board Initiative, more than 1,000 independent directors of public companies attended at least one of J.P. Morgan’s board events to discuss, debate and share best practices on the key issues they faced in the fulfillment of their duties.

Stephen also made important contributions to J.P. Morgan’s culture through his deep support of recruiting, training and development, and mentoring, and he helped to build and maintain a robust control environment through his participation on the firm’s Equity Underwriting and Reputational Risk Committees.

Stephen graduated from MIT in 1982 with an S.B. in mathematics. He is a member of the Visiting Committee for MIT’s Department of Mathematics and a former member of the board of trustees of the Mahaiwe Performing Arts Center in Great Barrington, Massachusetts.



  • Managing Partner

    June, 2017 - present