Jarrett Allen was born in 1998 in Austin, Texas. He is the son of Leonard and Cheryl Allen. Jarrett's father, Leonard, played college ball at San Diego State, was drafted by the Dallas Mavericks and played professional basketball in Europe. Allen attended his freshman year of high school at Round Rock High School in Round Rock, Texas. He then transferred to St. Stephen's Episcopal School in Austin for his final three years. At St. Stephen's, Allen led the Spartans to two SPC championships. After his senior season, Allen was named a 2016 McDonald's All-American. For three years running, Allen has hosted Meals + Math, a Thanksgiving event in which he provides money for groceries to local children and their families to help teach them about math and food budgeting. Allen is also a computer enthusiast. Follow the big center on Instagram and Twitter @_bigjayy_.