William Sheehan is an American musician known for playing bass guitar with acts such as Talas, Steve Vai, David Lee Roth, Mr. Big, Niacin, and The Winery Dogs. He is also known for his "lead bass" playing style, including the use of chording, two-handed tapping, "three-finger picking" technique and controlled feedback. Sheehan has been voted "Best Rock Bass Player" five times in Guitar Player readers' polls.