Leo Robin (April 6, 1900 – December 29, 1984) was an American composer, lyricist and songwriter. He is probably best known for collaborating with Ralph Rainger on the 1938 Oscar-winning song "Thanks for the Memory," sung by Bob Hope and Shirley Ross in the film The Big Broadcast of 1938, and with Jule Styne on "Diamonds Are a Girl's Best Friend," a song whose witty, Cole Porter style of lyric came to be identified with its famous interpreter Marilyn Monroe.

Source: Wikipedia (https://en.wikipedia.org/wiki/Leo_Robin)