Roger Jason Stone (born Roger Joseph Stone Jr.; August 27, 1952) is an American right-wing political activist, consultant and lobbyist. He is a prominent consultant and lobbyist within the New Right, and Donald Trump's longest-serving political adviser. He was the subject of widespread media coverage for the Mueller special counsel investigation and his alleged involvement with and connections to Russian interference in the 2016 U.S. presidential election as a consultant for the Trump campaign.