Campbell was chosen by the Dallas Stars with the No. 11 pick in the 2010 NHL Draft. He was the first goalie taken. Campbell spent seven seasons in the Stars organization, playing one NHL game, before being traded to the Los Angeles Kings for defenseman Nick Ebert on June 25, 2016.

After playing most of the next two seasons with Ontario of the American Hockey League, Campbell earned his first NHL win by making 41 saves in a 4-1 victory against the Vegas Golden Knights on Feb. 27, 2018, his first NHL start since Oct. 20, 2013. He appeared in five games, going 2-0-2 with a 2.47 goals-against average and .924 save percentage while backing up Jonathan Quick.

"This is the opportunity I've always wanted and worked for," Campbell told LAKings.com on March 13, 2018. "Now that it's here I just have to do everything I can to enjoy it and work as hard as I can to be ready."

Campbell finished 2018-19 with a 2.30 GAA despite a 10-14-1 record. He appeared to have settled into a backup role behind Jonathan Quick with Los Angeles until being traded to the Toronto Maple Leafs on Feb. 5, 2020.

Campbell was named to the Atlantic Division roster for the 2022 Honda NHL All-Star Game, the first time he participated in the event. He signed a five-year, $25 million contract with the Edmonton Oilers on July 13, 2022 after going 31-9-6 with a 2.64 goals-against average, .914 save percentage and five shutouts in 49 regular-season games (47 starts).

NOTES & TRANSACTIONS

• Played in NHL All-Star Game (2022)
• Traded to Los Angeles by Dallas for Nick Ebert, June 25, 2016.
• Traded to Toronto by Los Angeles with Kyle Clifford for Trevor Moore, Columbus' 3rd-round pick in 2020 NHL Draft (previously acquired) and a conditional pick in 2021 NHL Draft, February 5, 2020.
• Signed as a free agent by Edmonton, July 13, 2022.