Radio drama
Arch Oboler, who took over the writing of "Lights Out" when Cooper left, would suggest that Cooper was the first person to create a unique form of radio drama, writing, "Radio drama (as distinguished from theatre plays boiled down to kilocycle size) began at midnight, in the middle thirties, on one of the upper NBC floors of Chicago's Merchandise Mart. The pappy was a rotund writer by the name of Willys "(sic)" Cooper."