Got his start in golf at a 9-hole course in Knowlton, Quebec, Canada, which is about an hour east of Montreal. The family spent about a month there every summer in Campbell's youth, as his father, Don, is from Montreal.

Got his first golf lesson from Dan Anselmo at Strawberry Farms Golf Course in Irvine, California. Dan is the son of John Anselmo, who is known for serving as Tiger Woods' coach for seven years (1987-1993).

Grew up in Irvine, California and attended Mater Dei High School in nearby Santa Ana. Mater Dei also produced Heisman Trophy winner and former NFL quarterback Matt Leinart, Heisman Trophy winner and No. 1 overall pick in the 2023 NFL Draft Bryce Young, as well as NFL All-Pro wide receiver Amon-Ra St. Brown, and former NFL quarterback Matt Barkley.

After finishing as low amateur at the 2015 U.S. Open at Chambers Bay, received a congratulatory message from Chicago Blackhawks defenseman with the same name, Brian Campbell.

Spent roughly seven years (2015 post-college through 2022) living in Costa Mesa, California. Campbell and PGA TOUR winner Jake Knapp lived together for the last couple years of Campbell's time there, with the two sharing a house at the end of the driving range at Mesa Verde Country Club.

Brother, Derek Campbell, played baseball at University of California-Berkeley and was twice selected in the MLB Draft (36th round to the Chicago Cubs in 2013, then the 20th round to the Philadelphia Phillies in 2014). Derek advanced as high as AA in the minor leagues and last played minor league baseball in 2017.

Played four seasons at University of Illinois (2011-15), winning four times individually -- including two NCAA Regionals -- and helping the Fighting Illini to team titles at the Big Ten Conference Championship in 2012, 2013, and 2015.

Earned All-America Second Team selections in 2014 and 2015, along with the 2014 Big Ten Player of the Year award, and All-Big Ten recognition in 2013, 2014, and 2015.

Qualified for the 2014 and 2015 U.S. Opens and finished T27 in the latter for low amateur honors.

Reached the semifinals of the 2014 Western Amateur, where he fell to Xander Schauffele.