The founding partners were: Allison Schofield, Raymond Hanson, Arthur Bridgett, Gerald Marcus and Thomas Jenkins.

[8] In 2022, Hanson Bridgett was a founding member of the Legal Alliance for Reproductive Rights, a coalition of United States law firms offering free legal services to people seeking and providing abortions in the wake of Dobbs v. Jackson Women's Health Organization, which overruled Roe v.

[9] Andrew Giacomini has been managing partner since 2001 and joined Hanson Bridgett after finishing law school in 1991.

Gary Giacomini, current partner at Hanson Bridgett, was a longtime member of the Marin County Board of Supervisors and State Coastal Commission.

In addition to the San Mateo County Transit District (SamTrans) and Caltrain, Hanson Bridgett services transit and water agencies throughout California, as well as agencies like the Golden Gate Bridge, Highway & Transportation District, which maintains the Golden Gate Bridge.