USW: Tip the World Over on Its Side
Clark is the proprietor of the American Café, and tries to affect the same cynical tavern-keeper image as Rick Blaine. Not much is known about him, other than he clearly has a thing for old movies.
His thing for old movies appears to be symbolic; Clark is a Cinemancer, able to bring movie tropes to life by enacting them.
Image retrieved from https://www.mensusa.com/199/Tuxedos/Shawl-Collar-Tuxedos on June 3, 2016.