William Keating is a prominent American politician and member of the Democratic Party. He has served as the U.S. Representative for Massachusetts's 9th congressional district since 2011. Keating is known for his work on issues such as national security, environmental protection, and economic development. Before his time in Congress, Keating was the District Attorney for Barnstable County and served in the Massachusetts State Senate. He has a background in law and has been involved in various community initiatives throughout his career, focusing on improving the lives of his constituents.