Karl Alexander (August 23, 1938 – March 30, 2015) was an American writer. Born and raised in Los Angeles, he was the son and nephew of screenwriters—his father, William Tunberg, wrote the screenplay for Old Yeller, and his uncle, Karl Tunberg, wrote the screenplay for Ben-Hur—and worked on a number of films himself.
He was the author of Time After Time—which was adapted into a successful film of the same title in 1979, a musical in 2010, and a television series to premier in the fall of 2016.—and several other novels.
Jaclyn the Ripper, Alexander's sequel to Time After Time, was published in March 2011.
Alexander died on March 30, 2015 in West Los Angeles.