Joe Gebbia, the Airbnb co-founder, is a board member at Tesla who lives in Austin, where Mr. Musk, Tesla’s chief executive, keeps a large compound. He is planning to start shortly in the federal government as part of Mr. Musk’s team, which has been called the Department of Government Efficiency, according to the person with knowledge of the matter.

Billionaire Joe Gebbia is set to join Trump-led administration in a bid to assist his close friend Elon Musk in cutting expenses of the government.