Arch Oboler and Boris Karloff on Lights Out.

Lights Out is an old-time radio program devoted mostly to
horror and the supernatural.

Created by Wyllis Cooper and then eventually taken over by
Arch Oboler, versions of Lights Out aired on different networks,
at various times, from January 3, 1934 to the summer of 1947
and the series eventually made the transition to television.

Lights Out was one of the earliest radio horror programs,
predating Suspense and Inner Sanctum. 

Wyllis Oswald Cooper
(January 26, 1899 – June 22, 1955)