Dan Regan is a former trombone player for the SoCal-based Ska Punk band Reel Big Fish. He joined the band in 1994 and retired in October 2013. Regan has also played trombone in The Littlest Man Band with Scott Klopfenstein (also formerly of Reel Big Fish) and had an Electronic side project under the alias Black Casper. He was the second longest-lasting member of Reel Big Fish. He is now a founder of the craft brewery Liberation Brewing Co. in Long Beach, California.