What did he do after he left the show?

He was a guest on This Is Your Life for Shirley Jones , but other than that he stayed out of show business.

He (https://en.wikipedia.org/wiki/Jeremy_Gelbwaks) graduated from college in 1982, and became (http://manhattaninfidel.org/2017/01/31/my-exclusive-interview-with-the-sad-tragic-jeremy-gelbwaks/#comment-342935) a computer analyst while studying chemistry at UC Berkeley. He worked in the computer industry until 1999, studied business at Columbia University, and became a management consultant.