Harry Kemelman was an American mystery writer and a professor of English. He was the creator of one of the most famous religious sleuths, Rabbi David Small.

His writing career began with short stories for Ellery Queen's Mystery Magazine featuring New England college professor Nicky Welt, the first of which, "The Nine Mile Walk", is considered a classic.

The Rabbi Small series began in 1964 with the publication of Friday the Rabbi Slept Late, which became a huge bestseller, a difficult achievement for a religious mystery, and won Kemelman a 1965 Edgar Award for Best First Novel. The Rabbi Small books are not only mysteries, but also considerations of Conservative Judaism.