Philadelphia 76ers (2014–2016) After going undrafted in the
2014 NBA draft, Sampson joined the
Philadelphia 76ers for the
2014 NBA Summer League. On September 29, 2014, he signed with the 76ers. On November 21, 2014, he was assigned to the
Delaware 87ers, the 76ers'
D-League affiliate. Three days later, he was recalled by the 76ers. On February 18, 2016, he was waived by the team.
Denver Nuggets (2016) On February 22, 2016, Sampson signed with the
Denver Nuggets. The next day, he made his debut with the Nuggets in a 114–110 loss to the
Sacramento Kings, recording one rebound and one steal in fourteen minutes off the bench. On October 15, 2016, he was waived by the Nuggets.
Iowa Energy (2016–2017) On October 21, 2016, Sampson signed with the
Memphis Grizzlies, but was waived the next day. Seven days later, he was acquired by the
Iowa Energy of the
NBA Development League as an affiliate player of the Grizzlies. On February 6, 2017, he was named in the Western Conference All-Star team for the 2017 NBA D-League All-Star Game.
Sacramento Kings (2017–2018) On July 29, 2017, Sampson was signed to a
two-way contract by the
Sacramento Kings of the NBA. Under the terms of the deal, for the 2017–18 season, he will have a one-year deal splitting time between the Kings and their G-League affiliate, the
Reno Bighorns. On December 6, 2017, Sampson grabbed a career-high 16 rebounds in a loss to the
Cleveland Cavaliers. Sampson played 35 games with the Bighorns and averaged 17.9 points, 7.1 rebounds and 1.06 steals per game.
Windy City Bulls (2018) On September 24, 2018, Sampson signed with the
Chicago Bulls for training camp. On October 20, 2018, the
Windy City Bulls announced that they had acquired the returning rights to Sampson Johnson and the No. 38 overall pick in the
2018 NBA G League Draft, Mike Amius from
Iowa Wolves for the returning rights to
Jarell Eddie and
Jaylen Johnson, and later on November 9, 2018, the
Windy City Bulls acquired Sampson.
Shandong Golden Stars (2018–2019) On December 19, 2018,
Shandong Golden Stars of the
Chinese Basketball Association (CBA) was reported to have signed Sampson in replacing injured
Donatas Motiejūnas.
Second stint with Windy City Bulls (2019) On January 29, 2019, the
Windy City Bulls re-acquired Sampson.
Chicago Bulls (2019) On March 31, 2019, the
Chicago Bulls announced that they had signed Sampson to a 10-day contract. Over four games with the Bulls, Sampson averaged 20.0 points and 8.0 rebounds off the bench.
Shandong Heroes (2019) On July 4, 2019, Sampson signed with the Shandong Heroes of the
Chinese Basketball Association (CBA).
Indiana Pacers (2019–2021) On August 2, 2019, Sampson signed a 1-year deal worth $1,737,145 with the
Indiana Pacers. On November 29, 2020, Sampson re-signed with the Pacers. On April 21, 2021, Sampson was suspended for one game without pay for headbutting
Patty Mills during an altercation between the Pacers and the
San Antonio Spurs.
Virtus Bologna (2021–2022) On September 27, 2021, Sampson signed a 2-year deal with
Virtus Bologna of the Italian
Lega Basket Serie A (LBA); the team also plays in the
EuroCup. After having ousted
Lietkabelis,
Ulm and
Valencia in the first three rounds of the
playoffs, on 11 May 2022, Virtus defeated
Frutti Extra Bursaspor by 80–67 at the Segafredo Arena, winning its first
EuroCup and qualifying for the
EuroLeague after 14 years. However, despite having ended the regular season at the first place and having ousted 3–0 both
Pesaro and
Tortona in the first two rounds of playoffs, Virtus was defeated 4–2 in the national finals by
Olimpia Milano.
Liaoning Flying Leopards (2022–2023) On September 23, 2022, Sampson signed with
Liaoning Flying Leopards of the
Chinese Basketball Association (CBA). ==Career statistics==