Develin attended Brown University, where he majored in engineering and played defensive line on the Brown Bears football team. As a freshman in 2006, he appeared in eight games. He recorded 12 tackles and one sack. In 2007, as a sophomore, he recorded 50 tackles, 13.5 tackles-for-loss, six sacks, three quarterback hurries, and three fumble recoveries. For the season, he was named Second team All-Ivy. As a junior, in 2008, he recorded 34 tackles, 9.5 tackles-for-loss, and three sacks. He was named Second team All-Ivy. As a senior in 2009, he recorded 53 tackles, 16 tackles-for-loss, five sacks, one interception, and two fumble recoveries.
Career statistics
Professional career
Develin went undrafted in the 2010 NFL Draft, as expected. He attended a tryout with the Cleveland Browns, but did not receive a contract offer.
Oklahoma City Yard Dawgz
Develin originally signed with the Oklahoma City Yard Dawgz of the Arena Football League and appeared in one game.
Florida Tuskers
He then joined the Florida Tuskers of the United Football League, where he converted from defensive line to fullback. Develin played under Tuskers' head coach Jay Gruden.
Cincinnati Bengals
On November 30, 2010, the Cincinnati Bengals signed Develin to their practice squad. On February 3, 2011, Develin was reunited with his former head coach with the Florida Tuskers after Jay Gruden was hired to be the Bengals' new offensive coordinator. Throughout training camp, Develin competed for a roster spot as a fullback against Cedric Peerman and Fui Vakapuna. On September 3, 2011, the Cincinnati Bengals waived Develin, but signed him to their practice squad the next day after he cleared waivers. Develin spent the entire 2011 season on the Bengals' practice squad. On August 31, 2012, the Cincinnati Bengals waived Develin as part of their final roster cuts.
New England Patriots
2012 season
On September 2, 2012, Develin was signed to the New England Patriots' practice squad. He was promoted to the active roster on November 28, 2012. On December 16, 2012, Develin made his professional regular season debut during the Patriots' 41-34 loss to the San Francisco 49ers in Week 15. Develin was limited to one game as a rookie in 2012.
2013 season
Throughout training camp, Develin competed against Ben Bartholomew for a roster spot as a fullback and special teams player. On September 2, 2013, the Patriots released Develin as part of their final roster cuts. On September 6, 2013, he was re-signed after tight endMatthew Mulligan was released. Head coach Bill Belichick named Develin the starting fullback to begin the regular season. He made his first career start in the Patriots' season-opening 23-21 win at the Buffalo Bills. On December 1, 2013, Develin had two carries for four-yards and scored his first NFL touchdown during a 34-31 win at the Houston Texans. Develin appeared in all 16 games, starting six. He recorded four carries for 10 yards and a touchdown, and four receptions for 62 yards.
2014 season
In 2014, Develin appeared in all 16 games, starting four. He recorded three carries for five yards and six receptions for 43 yards. He also recorded a receiving touchdown in the Patriots' 45-7 drubbing of the Indianapolis Colts in the AFC championship game. The Patriots won Super Bowl XLIX by a score of 28-24 against the Seattle Seahawks. Develin recorded 1 catch for 6 yards in the Super Bowl.
2015 season
On September 1, 2015, Develin was placed on season-ending injured reserve after breaking his right tibia in a preseason game against the Carolina Panthers.
2016 season
Develin re-signed with the Patriots to a one-year contract on March 7, 2016. On February 5, 2017, Develin was part of the Patriots team that won Super Bowl LI. In the game, he appeared on ten plays on offense and ten on special teams as the Patriots defeated the Atlanta Falcons by a score of 34–28 in overtime.
2017 season
On March 6, 2017, Develin signed a two-year contract extension with the Patriots. The deal included a $300,000 signing bonus, $200,000 in guaranteed salary, and a maximum value of $2.85 million. On December 19, 2017, Develin was selected to the Pro Bowl as a starting fullback. Develin could not play in the Pro Bowl because of his team advancing to Super Bowl LII. The Patriots lost in the Super Bowl to the Philadelphia Eagles by a score of 41-33 without Develin recording any statistics.
2018 season
On June 14, 2018, Develin signed a two-year, $3.8 million contract extension with the Patriots through the 2020 season. He played the second-most snaps of any fullback after the San Francisco 49ers' Kyle Juszczyk. He had career highs in touchdowns, with four rushing touchdowns in a three-game span, and receptions, with 12. Develin helped the Patriots reach Super Bowl LIII where they defeated the Los Angeles Rams 13-3. Prior to the game, former running back and NFL analyst Maurice Jones-Drew called Develin the most important running back in the game, noting that he provided key blocks in all four of the Patriots' rushing touchdowns in the AFC Championship game against the Kansas City Chiefs.
