Patrick Duffy (born March 17, 1949) is an American actor, best known for his role on the CBS primetime soap opera Dallas, where he played Bobby Ewing, the youngest son of Miss Ellie and the nicest brother of J.R. Ewing (played by Barbara Bel Geddes and Larry Hagman respectively) from 1978 to 1985 and from 1986 to 1991. Duffy returned to reprise his role as Bobby in a continuation of Dallas, which aired on TNT from 2012 to 2014. He is also well known for his role on the ABC sitcom Step by Step as Frank Lambert, from 1991 to 1998, and for his role as Stephen Logan on the CBS daytime soap opera The Bold and the Beautiful (2006-2011). Duffy played the lead character's father in the 2014 NBC sitcom Welcome to Sweden.
Duffy was born in Townsend, Montana, in 1949, the son of tavern owners Marie and Terence Duffy. During high school, Duffy was living in Everett, Washington, and attended Cascade High School. At Cascade, he participated in the Drama Club and the Pep Club, for which he was a Yell King. Academically, Duffy earned credentials in theater arts that entitled him to teach, graduating from the University of Washington in 1971 with a degree in drama. He ruptured both his vocal cords during his senior year of college, so he created the position of actor-in-residence, where he worked as an interpreter for ballet, opera, and orchestra companies in Washington. He also taught mime and movement classes during this period.