Mark Sloan (Grey's Anatomy)

Mark Everett Sloan, MD, FACS, was a fictional character on the ABC television series Grey's Anatomy, portrayed by actor Eric Dane. Created by the show's executive producer and creator Shonda Rhimes, the character was introduced in Season 2 as the former best friend of Derek Shepherd (Patrick Dempsey).

Source: Wikipedia — Mark Sloan (Grey's Anatomy) (CC BY-SA 4.0)