William Murray Happer (born October 4, 1972) is an American professional wrestler and trainer, best known by his ring name Otto Schwanz.
He is one of the top independent wrestlers in the Southern United States, competing primarily in the Carolinas since the mid-2000s, and has wrestled for many of the region's leading promotions including CWF Mid-Atlantic, Cueball Carmichael's Independent Pro Wrestling Alliance, OMEGA, and Southern Championship Wrestling.
From 1998 to 2003, Happer was also a member of The Dupps, along with kayfabe "cousins" Jack and Puck Dupp, wrestling as Bo Dupp in Extreme Championship Wrestling, Total Nonstop Action Wrestling, and World Wrestling Entertainment.
While under a developmental contract with WWE, Happer also competed under his real name until being released in 2001.
Outside of pro wrestling, Happer is an educator and instructor in high school athletics.
He was a co-captain of the Georgetown Hoyas football team while attending Georgetown University and, in 2003, became head coach of South Johnston High School's Trojans wrestling team in addition to teaching civics and history.