Dr. Yen Lo is a New York hip-hop duo consisting of Brownsville rapper Ka and underground producer Preservation. They released their first collaborative full-length album, Days With Dr. Yen Lo, in May 2015. The name 'Dr. Yen Lo' is a reference to the character of the same name from the 1962 political thriller The Manchurian Candidate, about a Korean War hero who is brainwashed by Communists and ordered to assassinate an American politician.