President, The Celeste Group
Governance & Sustainability Center Fellow, The Conference Board
Tim is a strategic nonprofit and corporate executive and consultant. He currently serves as the Executive Director of Signature Theatre, a nonprofit theater organization in New York, and as President of The Celeste Group, a management consulting firm.
From 2006-2021, Tim was President of the American Express Foundation and Senior Vice President of Corporate Social Responsibility at American Express where he led the company’s global responsibility, philanthropy, sustainability, and employee engagement programs.
He is the former Executive Director of the AT&T Foundation and Second Stage Theater and practiced law with nonprofit organizations as clients. He also has held management positions at the National Endowment for the Arts and Western Illinois University.
Tim is recognized as a thought leader in corporate social responsibility, leadership development and nonprofit management through numerous publications, speeches, and media interviews. He has been a regular contributor to Forbes.com on leadership and philanthropy, and he currently writes a bi-monthly newsletter on CSR and Philanthropy Today for Substack. Tim also serves as a Governance and Sustainability Fellow at The Conference Board.
Tim is an adjunct professor at New York University where he teaches graduate level courses in arts administration and nonprofit management, and he previously taught at Brooklyn College and Johns Hopkins University where he was the lead faculty member for the Institute for Corporate Social Responsibility.
He currently serves on the boards of the Taproot Foundation, Signature Theatre and the Mark Morris Dance Group and has previously served on several nonprofit boards, including Independent Sector, Americans for the Arts, Second Stage Theater, Cunningham Dance Foundation, and New Visions for Public Schools.
Tim holds a J.D. from Georgetown University (DC), a M.S. in Counseling Psychology from St. Cloud University (MN), and a B.A. from Luther College (IA).