2024 Indoor: Set a new school record in the indoor Long Jump with mark of 6.67m at the Ken Shannon Invite.
2024 Outdoor: Recorded a mark of 6.70m in the Long Jump at the WAC Outdoor Championships.
2023 Outdoor: Set the school record in the long jump (6.90m) at the Stanford Invitational… set the school record again in the long jump (7.00m) at the WAC Championship… set the ninth best triple jump mark in program history (12.67m)
Competed for Marysville Pilchuck High School in Marysville, Washington where he played football, basketball, and track... ranks third all-time in the long jump and triple jump... 2022 3A Wesco North League long jump, triple jump, and 4x100m relay Champion... 2022 3A NW District 1 long jump, triple jump, and 4x100m Relay Champion... finished 3rd in the triple jump, 3rd in the 4x100m Relay, and 5th in the long jump at the 2022 WIAA 3A State Championship meet... 3rd place team finish at the 2021 WIAA 3A Football State Championship, 5th place team finish at 2020 WIAA Basketball State Championship... set personal bests of 22'8 ft in the long jump and 42.55 ft in the triple jump
Jamaari Maurice Jefferson was born in Everett, Washington... guardians are Antonio Jefferson, Angela Topash, and Brittney Curtice... has three siblings, Kaliyah, Brenden, and Delonn... cousins with Justin Jefferson, who is a Wide Receiver for the Minnesota Vikings, and Frank Gore, who was a Running Back for the San Francisco 49ers.