Wiener has served in the California State Senate, representing the 11th district, since 2016.

He previously served on the San Francisco Board of Supervisors from 2011 to 2016.

• He is known for authoring legislation to increase housing production, including SB 35 (2017) and SB 79 (2025), and California's first law regulating frontier artificial intelligence models, SB 53 (2025).

• In 2026, he advanced to the general election for California's 11th congressional district, the seat being vacated by Nancy Pelosi.

• He is a member of the Democratic Party.