Mark James DeSaulnier is a U.S. Representative for California's 10th congressional district, having served since January 6, 2015. A member of the Democratic Party, he has focused on issues such as healthcare, education, and infrastructure during his time in office. DeSaulnier has been an advocate for environmental protection and has worked on legislation aimed at addressing climate change. Before his tenure in Congress, he served in the California State Senate and the California State Assembly, where he gained experience in state-level governance.