he's best known for his role as J.R. Ewing on the TV hit series 'Dallas' (1978 - 1991) and as Anthony Nelson on the TV hit series 'I Dream of Jeannie' (1965 - 1970)
I like him most for these two roles (J.R. and Major Nelson), and I liked him very much as Frank O'Malley in the TV film 'The Last of the Good Guys' (1978)
he had a liver transplant on 23. August 1996
his mother was the famous actress/singer Mary Martin (* 01. December 1913, + 03. November 1990)
his father was Ben Hagman, an attorney
since 1954 he's married to Maj Axelsson