LOS ANGELES, Jan 29 (TheWrap.com) - Ian Ambercrombie, the classically trained British stage actor best known to American TV audiences as Elaine Benes' nutty boss Mr. Pitt on "Seinfeld," died of a heart attack Thursday in Los Angeles. He was 77. Abercrombie appeared on several other U.S. TV shows. He played the 800-year-old Professor Crumbs on "Wizards of Waverly Place and a butler on "Desperate Housewives," and made guest appearances on "Twin Peaks," "Dynasty" and "Days of Our Lives. ...