He is best known for his portrayals of Cole Turner in The WB hit series Charmed, womanizing plastic surgeon Christian Troy on the Emmy and Golden Globe award-winning TV show Nip/Tuck, and Doctor Doom in Fantastic Four and Fantastic Four: Rise of the Silver Surfer. McMahon has Irish ancestry. He briefly studied Law at the University of Sydney and Economics at the University of Wollongong, but this bored him and he started a successful modeling career. in addition to a career as a fashion model, including a jeans commercial for Levi Strauss, McMahon began an acting career on Australian soap Home and Away, playing the soldier Ben Lucini (1989-1991). Adam Willits, Sharyn Hodgson (who played his on-screen wife, Carly), Mouche Phillips and Justine Clarke also starred.

McMahon was born in Sydney, Australia, the second of the three children of Billy McMahon, MP and future Australian Prime Minister, and his wife Sonia McMahon, a former occupational therapist and fashion icon. He has an older sister, Melinda, and a younger sister, Deborah. McMahon has Irish ancestry. McMahon was educated at Sydney Grammar School, a private boys’ school. in 1994 he married Australian singer and actress Dannii Minogue. in addition to a career as a fashion model, including a jeans commercial for Levi Strauss, McMahon began an acting career on Australian soap Home and Away, playing the soldier Ben Lucini (1989-1991). Adam Willits, Sharyn Hodgson (who played his on-screen wife, Carly), Mouche Phillips and Justine Clarke also starred.

Julian Dana William McMahon (English pronunciation: /’d?u:li?n m?k’m?:n/; born 27 July 1968) is an Australian actor and former fashion model. He has an older sister, Melinda, and a younger sister, Deborah. He then appeared in the film Wet and Wild Summer.