ABC ‘Thirtysomething’ Actor Now an Advisor to ‘Good Morning America’ By Alex Weprin on Aug. 4, 2010 - 12:40 PM What do the late 80’s drama series “Thirtysomething” and “Good Morning America” have in common? Yes, both appear (or appeared) on ABC, but now they also share a familiar face: Peter Horton. Horton, wh ...