He replaces Bill Skinner, who retired after heading up VT Halter since April 2009. Skinner previously served as president of Alabama Shipyard Inc. from 1989 to 1997 after its acquisition by Atlantic Marine. Prendergast, a retired Navy rear admiral, joined VT Halter as an outside director in 2011 and was named executive vice president in 2012. After retiring from the Navy, he worked for Lockheed Martin for several years before joining VT Halter. Based in Pascagoula, Miss., Halter specializes in the design and construction of medium-sized ships.