Dr. Sloan is an attending specializing in plastic surgery. Dr. Sloan earned the nickname “McSteamy” for his good looks by the female interns of Seattle Grace later Seattle Grace Mercy West Hospital. He was good friends with Dr. Derek Shepherd, a fellow physician at Seattle Grace, but was the catalyst for the end of Derek’s marriage when he caught Dr. Sloan sleeping with Addison, his wife. Later, he pursues a 'forbidden' relationship with Dr. Lexie Grey, straining his relationship with Derek yet again. He reveals that he loves Lexie in episodes & ... more on Wikipedia