Career
In 1965 he was elected as German Sportspersonality of the Year. In 1962-1963 Klein studied industrial engineering at the University of Southern California. In 1969-1985 he worked at the Hessian Economic and Traffic Ministry, between 1985 and 1997 was a Darmstadt District Administrator, and from 1997 until his retirement in 2008 was the manager of the Supply and Transport Company of Leipzig.
In addition, in 2001-2007 he acted as president of the German Olympic Society.