Johnson grew up in Oakland, California, and initially attended Envision Academy of Arts & Technology.[3] He transferred to San Leandro High School before his senior season.[1] Johnson 14.4 points, eight rebounds, three assists, 2.3 blocks, and 1.9 steals per game and was named the West Alameda County Conference Foothill League co-MVP in his lone season at San Leandro.[4] He committed to playing college basketball for San Diego State.[5]
College career
Johnson began his college career at San Diego State.[6] Johnson averaged 7.2 points and 4.5 rebounds per game as a junior.[7] He averaged 7.7 points and five rebounds per game during his senior season.[8] After the season, Johnson decided to utilize the extra year of eligibility granted to college athletes who played in the 2020 season due to COVID-19 pandemic and entered the NCAA transfer portal.[9]
Johnson transferred to Arizona.[10] He averaged 11.5 points, 5.9 rebounds, 1.8 assists, 0.7 blocks, and 1.0 steals per game.[11]