He competed in various freestyle sprint events at the 1960 and 1964 Olympics and won three silver and one bronze medals in 1964.

[1] 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.

This article about a swimming Olympic medalist for Germany is a stub.