Scannell began his coaching career as assistant baseball coach at the
University of Massachusetts Amherst in 1993. He then returned to his alma mater
Northeastern University where the Huskies captured the
NAC title and advanced to
1994 NCAA Division I baseball tournament. In 1999, Scannell became the head baseball coach at Trinity after two years as assistant coach. Since taking over in 1999, Scannell has become the winningest Trinity baseball coach in history having amassed a record of 709–268 as of 2020. His winning percentage of .726 places him in the top-10 among active Division III coaches. He has also guided the Tigers to nine
Southern Collegiate Athletic Conference Championships. == Personal ==