Which mathematician is mentioned in the title of a song musical cats?

The mathematician mentioned in the title of the musical Cats is Andrew Lloyd Webber. He is an English composer and musical theatre producer. He is the composer of numerous musicals, including Cats, Evita, Sunset Boulevard, Phantom of the Opera, Jesus Christ Superstar, Joseph and the Amazing Technicolor Dreamcoat, School of Rock, and many others. Cats is based on T.S. Eliot's Old Possum's Book of Practical Cats and tells the story of a tribe of Jellicle Cats and their annual Jellicle Ball, where one cat is chosen to ascend to the Heaviside Layer and be reborn into a new life.