Our Team

Rebecca Foster

Chief Executive Officer

Rebecca Foster

Chief Executive Officer

Rebecca (she/her) is the founding CEO of the San Francisco Housing Accelerator Fund, a public private partnership that provides powerful new tools to improve the delivery of affordable housing. Since 2017, the Fund has invested over $300 million in housing preservation and development projects throughout San Francisco, supporting over 1,500 permanently affordable homes for more than 2,600 residents vulnerable to displacement and homelessness. Previously, Rebecca served as Director of Social Impact Investment under the late Mayor of San Francisco Ed Lee, and before that was a Vice President in Public Sector & Infrastructure investment banking at Goldman Sachs, where she raised capital for local governments, universities, non-profits, and utilities around the country. She received her BA. from Brown University and her MBA from the Stanford Graduate School of Business. Rebecca was appointed to the Board of Directors of the California Housing Partnership Corporation by Governor Newsom, and also serves on the boards of the San Francisco Friends School and ARTA, a whitewater rafting organization. She lives in San Francisco with her husband and three boys.

Tamar Dorfman

Chief Financial Officer

Tamar Dorfman

Chief Financial Officer

Tamar (she/her) joined the Housing Accelerator Fund as Chief Financial Officer. Most recently, she served as CFO of the Public Health Institute, one of the largest and most comprehensive public health organizations in the nation, where she oversaw the finance & accounting, grants & contracts, and audit & compliance teams. Tamar brings more than two decades of experience at non-profit and public sector organizations that promote equitable and just communities through economic development, public health, and affordable housing. Her career has focused on developing strong financial strategies and efficient operations so that organizations can maximize impact while ensuring compliance with funder and regulatory requirements. Prior to PHI & HAF, Dorfman was the Chief Financial Officer for PolicyLink, and the Mayor’s Offices of Community Investment and Housing in San Francisco (a precursor to the current Mayor’s Office of Housing & Community Development). She also served as the Fiscal Manager for the Corporation for Supportive Housing and was a Principal Budget Analyst for the City of Chicago. She holds a Masters in Public Policy from the University of Chicago and a Bachelor’s degree from Stanford University. Tamar lives in Oakland, where she was raised.

Justin Chen

Senior Vice President of Lending and Capital

Justin Chen

Senior Vice President of Lending and Capital

Justin (he/him) serves as Senior Vice President of Lending and Capital at the San Francisco Housing Accelerator Fund. Prior to joining SFHAF, he was Senior Loan Officer at Enterprise Community Loan Fund, where he closed on over $150 million in loans for affordable housing developments and community facilities in the Bay Area and nationally. Previously, Justin directed Nonprofit Finance Fund’s California lending program and was a Social Investments Analyst for the Annie E. Casey Foundation in Baltimore. At the start of his career, Justin served in various lending and credit roles at Barclays Capital in New York and City First Bank of D.C. He has a Masters in City and Regional Planning from the University of California at Berkeley and received his BA from Northwestern University. Justin lives in San Francisco with his family, and is a proud parent of two students in the San Francisco Unified School District.

Cindy La

Senior Associate, Portfolio & Impact

Cindy La

Senior Associate, Portfolio & Impact

Cindy (she/her) joined the Housing Accelerator Fund as Senior Associate, Portfolio and Impact in May 2022. Prior to joining SFHAF, she worked at Federal Home Loan Bank of San Francisco on the Affordable Housing Program (AHP) and WISH first-time homebuyer program. She is a proud graduate of the California Coalition for Rural Housing Internship Program where she worked in the Lending and Housing Department at Rural Community Assistance Corporation. She received her B.S. in Community and Regional Development from UC Davis.

Ji-Ho Park

Finance & Investment Associate

Ji-Ho Park

Finance & Investment Associate

Ji-Ho (they / them) joined the San Francisco Housing Accelerator Fund to support the Fund’s lending, pipeline, and fiscal operations. Prior to joining the SFHAF, Ji-Ho was an engagement manager at The Concord Group, a San Francisco-based real estate consulting firm, where they completed engagements in a variety of product types and asset classes, with a focus on multifamily development and urban infill projects. Ji-Ho is a graduate of the Coro Fellowship in Public Affairs and earned their B.S. in Chemistry from Duke University. While at Duke, Ji-Ho interned with Larkin Street Youth Services in San Francisco and worked closely with Durham-based community development nonprofit Community Empowerment Fund, providing job training, educational development, and financial coaching services. Originally from Pittsburgh, Pennsylvania by way of Springfield, Illinois, they now live in San Francisco.

Kati Vastola

Operations & Communications Manager

Kati Vastola

Operations & Communications Manager

Born and raised in the Bay Area, Kati (she/her) is proud to be preserving its vibrancy and livability through her work at the San Francisco Housing Accelerator Fund. She joined in January 2020 to support operations, communications, and special projects. Before coming on board at SFHAF, Kati served as the Regional Affairs Manager at KIPP Bay Area Public Schools, a high-performing public charter school network. She holds a BA with Honors from Brown University and an MA from UC Berkeley, both in U.S. History. When she’s not in the office, she enjoys biking and running around Oakland in search of new fruit trees.