Montgomery was drafted by the Philadelphia Eagles in the sixth round of the 1977 NFL draft.[2] Wearing number 31, Montgomery played eight seasons with Philadelphia, shattering most Eagles' rushing records and leading the club in rushing six times. He concluded his NFL career with the Detroit Lions in 1985, and still holds or previously held seven Philadelphia rushing records, including: career attempts (1,465), rushing yards (6,538, broken by LeSean McCoy in 2014),[2] attempts in a season (338 in 1979), rushing yards in a season (1,512 in 1979, since broken by LeSean McCoy in 2013),[2] career 100-yard rushing games (26), 100-yard rushing games in a season (8 in 1981), and touchdowns in a game (4). In the 1980 NFC championship game, Montgomery rushed for a franchise postseason record 194 yards, leading the team to Super Bowl XV, the first Super Bowl in team history. In 1979, Montgomery led the NFL with 2,012 all-purpose yards (rushing, receiving, returns). Over his NFL career, he accumulated 6,789 yards rushing, 2,502 receiving, 814 kickoff return yards, 57 touchdowns (45 rushing, 12 receiving, 1 kickoff return), and two Pro Bowl invitations (1978–79).
Montgomery joined the St. Louis Rams' coaching staff as running backs coach in 1997, coaching Pro Bowl running backs Marshall Faulk and Steven Jackson. Under Montgomery's leadership, Faulk moved into 12th place on the NFL's rushing yardage list, and Jackson finished third in the NFL among rookie running backs. He won his first Super Bowl title when the Rams defeated the Tennessee Titans in Super Bowl XXXIV.[3]
He joined the Ravens in 2008 and was running backs coach through the 2013 season.[4] He won his second Super Bowl title when the Ravens defeated the San Francisco 49ers in Super Bowl XLVII.[5]
Montgomery was hired as running backs coach of the Cleveland Browns on February 6, 2014. He was not retained after Head Coach Mike Pettine was fired.[6]
Montgomery and his wife Patti have three children, twins Briana and Brendan, and a son, Tavian. Montgomery also has a daughter, Sherrita, and a son Derron, who was a wide receiver for the Iowa State Cyclones and a Graduate Assistant and Assistant wide receiver coach for the Miami Hurricanes. Derron was a wide receiver coach for the Michigan Wolverines, tight ends coach for his father's alma mater Abilene Christian University and is now the Offensive Quality Control - Assistant RB's coach for the Minnesota Vikings. Tavian is a current college sophomore, playing cornerback for Northern Arizona University.