A good question. He stopped directing in 1991 and hasn't really be heard of since. Some of earliest favourite movies were John Hughes movies, and although it's easy to pick flaws now, I still have soft spot for The Breakfast Club, and still love Ferris Bueller's Day.
Come to think of it what happened to all the stars of those films, where has Molly Ringwold gone? Those questions are also answered in part by the LA Times, though no explanation to what happened to “the duck man” from Pretty In Pink…
http://www.latimes.com/entertainment/news/movies