Peter Anthony DeFazio (born May 27, 1947) is an American politician. He serves as a Democratic U.S. Representative from Oregon, representing the 4th Congressional District an is currently serving his 11th term. DeFazio is Oregon's most senior member of Congress, which makes him the dean of Oregon's House of Representatives delegation. A native of Massachusetts and a veteran of the United States Air Force, he previously served as a county commissioner for Lane County, Oregon.