Gerald Mark McNerney ( mək-NUR-nee; born June 18, 1951) is an American businessman, politician, and the U.S. representative for California's 9th congressional district from 2007 until 2023. He is a member of the Democratic Party. His district, numbered as the 11th district until 2013, was based in Stockton and included parts of San Joaquin County, East Contra Costa County, and southern Sacramento County. McNerney holds a Ph.D in mathematics. McNerney did not run for reelection in 2022.On December 8, 2023, McNerney filed for an open seat in District 5 of the California State Senate, upending a dynasty-making move into the race by Assemblymember Carlos Villapudua.