Mark joined the William Morris Agency in 1982, to become a television packaging agent specializing in first-run syndication, pay and basic cable television. Mark has packaged such varied television series as: Real World, Project Runway, Hell’s Kitchen, Kitchen Nightmares, Deal or No Deal, Extreme Makeover: Home Edition, Tyler Perry’s House of Payne, Tyler Perry’s Meet the Browns, Big Brother, Fear Factor, People’s Court, The Ricki Lake Show, American Gladiators, Biggest Loser and Buffy the Vampire Slayer.

Until he retired in December 2015 Mark was Co-Head of Television at and a member of the Board of Directors of William Morris Endeavor (WME). Currently he is a corporate Board of Director, producer, consultant and an entrepreneur in the media business. Mark has been a member of the Academy of Television Arts & Sciences for thirty years, a two-term Governor, and spent six years on the Academy of Television Arts & Sciences Executive Committee. In addition, Mark chaired the Blue Ribbon Panel Committee which successfully instituted “at-home” viewing of the Prime Time Emmy Awards and was the Chairman of the ATAS Hall of Fame Committee for four years. Mark was also the first agent appointed to NATPE’s (National Association of Television Programming Executives) Executive Board. Mark is currently on the Board of Governors of Cedars-Sinai Hospital, on the Board of Directors of the Zimmer Children’s Museum, and on the Board of Directors for The National Aids Monument. Mark has been a Guest Lecturer at Harvard Law School.