JSAF Officers

Shayna Mittler Van Hoften


Shayna (Mittler) van Hoften counsels primarily local governments on ethics and governance laws, public procurements and contracting, civil rights law compliance, administrative procedures, constitutional matters and more. A partner at the law firm Hanson Bridgett LLP in San Francisco, Shayna serves as General Counsel for the East Contra Costa Fire Protection District and the five retirement boards for employees and retirees of the Sacramento Regional Transit District. She also sits as the primary deputy to the General Counsel of the San Mateo County Transit District (SamTrans), Peninsula Corridor Joint Powers Board (Caltrain) and the San Mateo County Transportation Authority.

Shayna credits JSA with providing the foundation upon which she has built her entire career advising public agencies and public officials, as well as private entities with government-related interests. Shayna enjoyed four active years in JSA including terms as Chapter President, Golden Gate Region Vice Mayor and Northern State Chief of Staff, as well as recognition as Northern State Statesperson of the Year in 1993. She attended and then worked at the JSA Summer Schools at Yale and Georgetown. Shayna earned her B.A. in Public Policy/Politics from Pomona College and then worked in political and policy communications in Washington D.C. before returning home to California to attend U.C. Berkeley’s Goldman School of Public Policy and Boalt Hall School of Law, where she earned an M.P.P. and J.D.

Gabriel Stempinski

Vice President

Gabriel Stempinski is the Founder and CEO of New Leaf, an IT and Management Consulting firm which specializes in managing large enterprise IT projects and tactical alignment post M&A. He is additionally an authority on the Sharing Economy and the Co-Author of a leading book on the topic “It’s a Shareable Life”. He additionally invests in and advises startups in the Collaborative Consumption / Sharing Economy space. Prior to founding New Leaf, Gabriel served in the US Navy on board the USS Enterprise working in the Reactor Laboratories department.

Gabriel is an alumnus (Class of 99’) of the Claremont JSA chapter from Claremont California and re-engaged with the Junior State in 2012 as a volunteer teaching debate workshops at the Northern California Fall State. Shortly before being asked to join the board in 2015 he lead a group of JSA students in the design, building, and launch of JSA’s first ever mobile application for conferences. He is passionate about fostering a spirit of activism and volunteerism within the community.

Gabriel currently lives in Orange County with his wife and three children.

Beth Freeman


Beth Freeman was appointed a United States District Judge for the Northern District of California in February 2014.
She was previously a Superior Court Judge in California’s San Mateo County for 13 years, handling family law, law and motion and general trial assignments. Freeman is a graduate of Harvard Law School and the University of California at Berkeley and was admitted to the Washington, D.C. Bar in 1979 and the California Bar in 1981.

Freeman served as an associate at the Washington law firm Fried Frank Harris Shriver and Kampelman and as an associate at the San Francisco law firm Lasky Haas, Cohler and Munter. She was a deputy county counsel in San Mateo from 1983-2000. Beth Freeman previously served as a JSA Director. She was the first women to hold the position of JSA Board President. She is currently a JSA Trustee.

Freeman attended Ravenswood High School in East Palo Alto, Calif., and was a member of the Junior State chapter there.

Doug Wertheimer


Doug Wertheimer has been a partner at Industry Capital since 2004. Industry Capital is a San Francisco based private equity firm focused on real assets globally. Prior the Industry Capital, Doug spent 10+ years as an entrepreneur, instrumental in starting several companies in industries ranging from new media technology to television production, and electronic payments to consumer wellness products. Notably, Doug was a member of the founding management team of pioneering electronic payments company, Size Technologies, acquired by First Data Corporation in 2006. Doug was also a Principal with Mark Burnett Productions, creators and producers of the original reality TV franchises "Survivor" and "Eco-Challenge".

Doug has an AB from Princeton University and a JD from UCLA School of Law. In high school, Doug was an active member of the JSA Chapter at Palisades High School in Los Angeles, serving on a number of regional cabinet positions. He attended JSA’s UC Davis summer program in 1981. Doug resides in San Francisco with his wife, Beth Mitchner. They have three sons, Nathan, Samuel and Benny.