Michael Tullis Nolan (born March 7, 1959) is an American football coach who most recently served as the defensive coordinator for the Dallas Cowboys of the National Football League (NFL). Nolan is a former head coach for the San Francisco 49ers, and a former defensive coordinator for the NFL's Baltimore Ravens, New York Jets, Washington Redskins, New York Giants, Denver Broncos, Miami Dolphins, and Atlanta Falcons. Nolan is a former linebackers coach for the Denver Broncos, San Diego Chargers, and New Orleans Saints.