Rube Bloom

Songwriter Rube Bloom, born 24 April 1902. He collaborated with a wide number of lyricists, including Johnny Mercer, Ted Koehler, and Mitchell Parish. He wrote "Fools Rush In" and "Day In, Day Out", each with lyrics by Johnny Mercer.

Another post that mentions Rube Bloom:
Mail Call
http://mercerjohnny.blogspot.com/2009/11/mail-call.html