Dan Regan was the trombone player for the Southern California-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 (formerly of Reel Big Fish) and currently has a hip-hop side project under the alias Black Casper. He was the second longest lasting member of Reel Big Fish from 1994 until October 2013. He currently is starting a brewery in Long Beach, California.