Has appeared in 486 career regular season games (421 starts) over seven seasons with Brooklyn and Cleveland…owns career averages of 12.7 points, 9.1 rebounds and 1.30 blocks in 28.2 minutes per game…also shooting .630 from the field…has 189 career double-doubles…has 224 games with at least 10 rebounds and six 20+ rebound performances. He was named an NBA All-Star in 2022 as a member of the Cavaliers, the lone selection of his career (the 2022 NBA All-Star Game was held in Cleveland).

Played one season at the University of Texas at Austin in 2016-17…appeared in and started all 33 games for the Longhorns, averaging 13.4 points, 8.4 rebounds and 1.5 blocks in 32.1 minutes per game…named to the All-Big 12 Conference Third Team and Big 12 All-Newcomer Team…claimed a spot on the 10-person USBWA All-District VII Team and five-person NABC All-District 8 Second Team…led the team in rebounding (8.4 rpg), blocked shots (51) and minutes played (32.1 mpg) and ranked second on the team in scoring (13.4 ppg)…shot .566 (179-of-316) from the field…reached double figures in scoring 25 times and double figures in rebounds 14 times…recorded 12 double-doubles on the season (tied for the third-highest total by a UT freshman in school history), including eight in Big 12 Conference play…in Big 12 Conference play (18 games), he averaged a team-best 16.2 points and 9.8 rebounds per game while shooting .599 (118-of-197) from the field…recorded a double-double with 16 points on 7-of-11 shooting from the field and 12 rebounds along with two blocks in 36 minutes during his collegiate debut against Incarnate Word on 11/11…posted 14 points (6-of-8 FG) and 13 rebounds in 35 minutes at Kansas State on 12/30…earned Phillips 66 Big 12 Conference Co-Newcomer of the Week honors on 1/16 after averaging 18.5 points, 8.0 rebounds and 2.0 blocks per game during UT’s two contests against No. 10 West Virginia and TCU…recorded 17 points and 10 rebounds while tying his career-high with three blocks in 31 minutes at No. 6 Baylor on 1/17…totaled a career-high 22 points and a career-high 19 rebounds (seven offensive) while tying his career-high with three blocks in 34 minutes at No. 2 Kansas on 1/21…his 19 rebounds marked the second-highest single-game total by a UT freshman in school history (Kevin Durant had 23 boards at Texas Tech on 1/31/07)…claimed Phillips 66 Big 12 Conference Newcomer of the Week honors on 1/23 after averaging 19.5 points, 14.5 rebounds and 3.0 blocks per game against a pair of Top 10 opponents on the road, No. 6 Baylor and No. 2 Kansas…tied his career-high with 22 points and added nine rebounds, a career-high three steals, two blocks and two assists in 36 minutes at TCU on 2/4…posted a game-high 17 points and nine rebounds in 34 minutes against Iowa State on 2/7…hit two free throws with 7.2 seconds remaining (facing a 1-and-1 situation) that proved to be the game-winning points against Iowa State on 2/7…posted 17 points, seven rebounds and two blocks while tying his career high in minutes played (37) at No. 12 West Virginia on 2/20… Recorded 20 points and 11 boards (five offensive) in 35 minutes against No. 3 Kansas on 2/25…tallied a game-high 20 points, along with nine rebounds and three blocks, in 36 minutes against No. 11 Baylor on 3/4…earned a spot on the Fall 2016 Big 12 Commissioner’s Honor Roll (minimum 3.0 GPA).

Is the son of Leonard and Cheryl Allen…has one older brother, Leonard II…father, Leonard, played basketball at San Diego State (1982-85); he was selected by the Dallas Mavericks in the third round of the 1985 NBA Draft (50th overall pick) and played professional basketball in Europe…won a gold medal with the USA U18 National Team at the FIBA Americas U18 Championship in July 2016 in Valdivia, Chile…led Team USA and ranked fourth in the tournament overall in rebounding (9.0 rpg) and topped the squad in minutes played (23.8 mpg)…ranked third on the team in scoring (10.6 ppg)…attended high school at St. Stephen’s Episcopal School in Austin, Texas and played basketball under head coach Lamont King…ranked as the No. 15 overall prospect in the nation by ESPN.com, Rivals.com and Scout.com following his senior season…named a McDonald’s All-American…ranked as the No. 1 center in the country by ESPN…averaged 19.7 points and 13.3 rebounds per game as a senior while leading St. Stephen’s to a 25-5 record and the Southwest Preparatory Conference title…scored 33 points in a 66-57 win against Bellaire Episcopal in the SPC championship game…is interested in computers.