Karl Tunberg wrote or co-wrote Rebecca of Sunnybrook Farm (1938), Down Argentine Way (1940), the Oscar-nominated Tall, Dark and Handsome (1941), Orchestra Wives (1942), the WGA- and Oscar-nominated Ben-Hur (1959), and episodes of the television series Bonanza, Mannix, and Cannon. He produced Kitty (1945), Up in Central Park (1948), You Gotta Stay Happy (1948), and The 7th Dawn (1964), among several other films.

He was born circa 1909 (1911, according to one source). Tunberg set out to be a teacher, but turned to script writing after he won a short story competition. He died in 1992 in London, where he lived during his last 20 years.