Long redshirted his first year at Boston College in 2017. In 2018, he played in 12 games and had four receptions for 103 yards and two touchdowns.[2] In 2019, Long had 28 receptions for 509 yards with two touchdowns.[3][4] He returned as the starting tight end in 2020 where he had 57 receptions for 685 yards and 5 touchdowns.[5][6][7]
Long was selected by the Miami Dolphins in the third round (81st overall) of the 2021 NFL draft.[11] Long signed his four-year rookie contract with Miami on July 26, 2021.[12]
Los Angeles Rams
On March 15, 2023, Long and a 2023 third-round draft pick (which was previously acquired from the New England Patriots) were traded to the Los Angeles Rams in exchange for cornerback Jalen Ramsey.[13] He was placed on injured reserve on September 9, 2023 with a thigh injury.[14] He was activated on November 14.
On December 8, 2024, Long scored his first NFL touchdown on a 22-yard blocked punt return during the Rams' 44–42 win over the Buffalo Bills.