 Denker was the originator and writer of what he describes as the "first television series ever produced," "False Witness", on NBC-TV in 1939.Despite its success, the series was discontinued when the nascent medium of television was converted into an instruction tool for the mass training of Air Raid Wardens in anticipation of the U.S. entry into World War II.Denker started writing for radio with three productions on CBS Radio's Columbia Workshop