Ken attended the University of Michigan and received an A.B. degree in 1955. He opened the Ken Hallenbeck Coin Gallery in Colorado Springs in 1983.
Ken was elected to the ANA board of governors in 1971. He resigned from the board in 1977 to fill a staff position as assistant to the executive director and curator of the ANA museum. Later he served as Vice President and was the 46th ANA President from 1989 to 1991. He returned to the ANA as acting executive director in August of 2007 for 7 months until a permanent executive director was hired.
Ken has received the ANA Goodfellow Award, Medal of Merit, Glen Smedley Memorial Award, Exemplary Service Award, Lifetime Achievement Award and the Farran Zerbe Award, the ANA’s highest honor. He is a Numismatic News Numismatic Ambassador.
Ken is an authority on counterstamped coins and he has contributed articles on counterstamped coins to The Numismatist, Coin World, Numismatic Scrapbook Magazine and others. He claims the world’s largest collection of credit cards and he also collects odd and curious money.