Fullback (gridiron football) to the role. The position is less frequently used in Canadian football, which focuses more on passing than running the ball. Fullback (gridiron football) A fullback (FB) is a position in the offensive backfield in American and Canadian football, and is one of the two running back positions along with the halfback. Typically, fullbacks are larger than halfbacks and in most offensive schemes their duties are split between power running, pass catching, and blocking for both the quarterback and the other running back. Many great runners in the history of American football have been fullbacks, including Jim Brown, Marion Motley,
Don Brown (American football coach) head coach Jim Harbaugh. Brown replaced former defensive coordinator D. J. Durkin, who had departed to take the head coaching job at Maryland. Don Brown (American football coach) Don Brown (born July 31, 1955) is an American college football coach and former player. He is currently the defensive coordinator at The University of Michigan. Previously, he served as defensive coordinator Boston College and at the University of Connecticut and as the head football coach at Plymouth State University (1993–1995), Northeastern University (2000–2003), and the University of Massachusetts Amherst (2004–2008), compiling a career college football head coaching record of 95–45. Brown