Alexander Mattison (born June 19, 1998) is an American professional football running back for the Miami Dolphins of the National Football League (NFL). He played college football for the Boise State Broncos and was selected by the Minnesota Vikings in the third round of the 2019 NFL draft. Early life Mattison attended San Bernardino High School in San Bernardino, California, where he played high school football. He rushed for over 2,000 yards in each of his final two seasons, going for 2,017 yards and 26 touchdowns as a junior and 2,057 yards and 22 touchdowns as a senior. Mattison was selected to play in the Inland Valley Football Classic following his senior season. In addition to football, Mattison also ran track and wrestled. As a senior, he won the Mountain Valley League title in the 110m hurdles. His personal-bests are 14.95 seconds (110m hurdles), 11.34s (100 meters), 23.34s (200 meters), 22 ft 9 in (6.93 m) in the long jump and 46 ft 5.5 in (14.161 m) in the shot put. He also won a league wrestling title at 195 pounds and was named all-league as a junior. He committed to Boise State University to play college football.