Clarke was born in 1996 in Vancouver, British Columbia, Canada and moved to the United States at the age of three. He was one of Arizona's top shot-blockers when attending Desert Vista High School in Phoenix. Clarke was able to lead the team to the Division I state championship in 2015. As a senior, he was named to the first-team All-Arizona Division I by the Arizona Republic, having recorded 10 triple-doubles. As a junior, he averaged 15.0 points, 7.0 rebounds, 4.0 assists and 4.0 blocks. Check out Clarke on Twitter (@brandonclarke23) and Instagram (@brandon_clarke23). Clarke led Gonzaga in rebounds per game (8.6) and was second in average points per game at 16.9 in his first and only season at the school. The Phoenix, Arizona native transferred from San Jose State to Gonzaga after two seasons. Clarke was named the West Coast Conference Rookie of the Year while at Gonzaga. He was also pegged for the 2018-19 All-WCC team. Clarke set a 2018-19 season-high mark of 36 points against Baylor in the second round of the NCAA tournament and led Gonzaga to the to the Elite Eight. He declared for the 2019 NBA Draft and was selected 21st overall by the Thunder. He was then traded to Grizzlies a few weeks later.