Friend's writing career began on the CBS crime series Martial Law, after which he served as a Writer and Producer on several series through the late 90's until the early 2000s, including FreakyLinks, Roswell, John Doe, Boston Public, LAX and Smallville. In 2005, he and Lerner joined the writing staff of the medical mystery series House. Their first episode, "Acceptance", was the premiere of the second season. At the start of the fourth season Friend became an executive Producer, a job which he currently still occupies. He is also a Consulting Producer and Writer on Glee.