Mullin is the son of Gene Mullin, who served three terms in the Assembly. Before being elected to the Assembly in 2012, he was an entrepreneur and served on the city council of South San Francisco, including one year as mayor. He served as speaker pro tempore of the Assembly from 2014 to 2022.
Before entering politics, Mullin was a local business owner and district director to then-state senator Jackie Speier. He also served as political director for his father, then-state assemblymember Gene Mullin.
As an entrepreneur, Mullin founded KM2 Communications, a multimedia production business in South San Francisco. He produced public affairs programming on local television and hosted various programs on Peninsula-TV Channel 26.
South San Francisco City Council
Mullin was elected to the South San Francisco City Council in 2007. He served one term on the council, including a one-year stint as mayor.
During his time on the council, Mullin also represented the cities of San Mateo County on the Metropolitan Transportation Commission.[1]
During his first term in the Assembly, Mullin served as assistant speaker pro tempore. He became speaker pro tempore of the Assembly in 2014, a position he held until leaving office in 2022.[1] In this role, he regularly presided over Assembly floor sessions and continued as part of Anthony Rendon's leadership team.
Notable legislation from Mullin's tenure includes Proposition 19, which offered support for fire victims, disabled, and the elderly. This proportion narrowly passed.[3]
Mullin left office on December 5, 2022. He was succeeded by Diane Papan.[4]
Following Speier's retirement, Mullin announced his candidacy to succeed her in the 2022 election. He defeated San Mateo County supervisor David Canepa with 55.8% of the vote.[5] Mullin described himself as a pro-Israel lawmaker and AIPAC spent around 600k dollars for him in the general election against fellow Democrat David Canepa.[6]
Mullin was sworn into the House of Representatives on January 7, 2023, when the 118th Congress convened.
Mullin left a California hospital bed with IV attached on February 25, 2025, flying to Washington for an emergency vote against a budget resolution that same day. The resolution, favored by president Trump, was not certain to pass. At the request of the Democratic leadership several Democrats who were absent with medical issues were secretly brought to Washington for the vote. The resolution ultimately passed by the narrowest possible margin.[16][17]
Personal life
Mullin is married to Jessica Stanfill Mullin, with whom he has twin sons.[18]
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