David Ketchum (born February 4, 1928 in Quincy, Illinois) is a writer and actor in Happy Days. David is best known for the portrayal of Agent 13 in "Get Smart" as well as appearing in other sitcoms such as "That Girl", "The Andy Griffith Show", "The Mary Tyler Moore Show", and "The Odd Couple". He first appeared in the episode R.O.T.C. as Army Lt. Col. Binicky, as Coach Pelino in A Shot in the Dark, and a recurring role as Donald Hedges in the finals seasons.

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