Our Team

Michael M. Weinstein

Michael M. Weinstein

Executive Director
Michael holds a Ph.D. in economics from M.I.T. and previously served as chief program officer for the Robin Hood Foundation. During the 1990s, he served on the editorial board of The New York Times and as the Times’ economics columnist.
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Elijah Goldberg

Chief Operating Officer
Elijah co-founded ImpactMatters with Dean Karlan and manages day-to-day operations for ImpactMatters. He previously co-founded Walimu, a health nonprofit in Uganda. He received his bachelor's degree in Economics from Yale.
Tamsin Chen

Tamsin Chen

Project Manager
Tamsin coordinates and conducts research for impact audits. She received her BA in International Studies and Economics from Vassar and led the Vassar Haiti Project.
Stephen Nunez

Stephen Nuñez

Research Manager
Steve leads research and analysis for ImpactMatters. He received his PhD in sociology and M.A. in economics from Stanford. He was previously a research associate at MDRC.
Alanna Walker

Alanna Walker

Development Manager
Alanna manages sales and fundraising. She previously worked at Ronald McDonald House and the Ellis Island foundation. She received her master of science in bioethics from Columbia University.
Josh Twersky

Josh Twersky

Operations Manager
Josh manages finances, human resources, technology and publications. He previously worked as a paralegal at Ladas and Parry LLP and as an operations supervisor at SPORTLOGiQ. He received his bachelor's degree from McGill University.
Stanley Pollak

Stanley Pollak

Controller
Stan oversees ImpactMatters financial operations. Over a thirty year career at Citigroup, he worked as CFO and Finance Director for multiple business units, most recently Strategy Sourcing and Procurement Services.
Veronica Vazquez Ugalde

Veronica Vazquez Ugalde

Senior Research Analyst
Veronica conducts research for impact audits. She received her master's degree in economic policy at Boston University.
Luisa

Luisa Rodriguez

Research Analyst
Luisa conducts research for impact audits. She received her B.A. from Carleton College and M.A. from Brandeis University. Before joining ImpactMatters, she worked at GiveWell and Innovations for Poverty Action.
Catherine Darin

Catherine Darin

Research Analyst
Catherine conducts research for impact audits. She received her B.A. from University of Pennsylvania and previously worked at Cornerstone Research.