BIO: Simpson was born in Los Angeles County, California, Simpson grew up in the San Francisco Bay Area city of Hayward and graduated from Hayward High School in 2005.
Diamon Simpson made his NBL debut with the Adelaide 36ers at 24 years of age. He scored 15 points in his first game.
Things didn’t get any better for the 36ers or coach Marty Clarke in the 2011/12 season. A complete roster rebuild saw only four of last season’s squad, Daniel Johnson, Darren Ng, Mitchell Creek and the injured Adam Ballinger returning. Adelaide’s backcourt had been a huge question mark last season and guards Nathan Crosswell (via Victoria) and Everard Bartlett (via NZNBL) were added to remedy that, while Nathan Herbert returned to the court after missing the entire 2010/11 season with a ACL injury. Imports Chris Warren and John Williamson were signed to finalise the roster, but a injury to import Williamson during the pre-season saw the 36ers play their opening game with one import, resulting in Adelaide’s largest opening night loss in team history to Perth (69-102).
Simpson, a college teammate Patty Mills, replaced Williamson and joined the 36ers in time for their second game. Simpson recorded his best game of the year in Adelaide’s 12 point victory over Perth (Dec 4 2011) when Simpson filled the box score with 22 points, 10 rebounds, 4 assists, 2 steals, 1 block in 26 minutes. Perhaps the most impressive thing about this feat is the fact he did it against the incredible front-line defence of the Wildcats, something which happened only four times that season (Adelaide being responsible for two of them).
Simpson (14.3 points, 8.6 rebounds, and 1.5 blocks) posted 12 double-doubles in his 27 games while leading Adelaide in scoring and finishing second in the league in rebounding.
Injury woes continued when new signing Nathan Crosswell saw his season cut short due to a Achilles tendon injury suffered in round 10 against New Zealand and despite gaining Adam Ballinger (5.5 points, 4.1 rebounds, and 0.9 assists) for the last half of the season, injuries kept him from being anywhere close to his former self, forcing him to play a role off the bench for the first time in his NBL career.
Adelaide finished the season in last place (8–20), including a club record losing streak of eight games.
While 36ers fans didn’t have much to cheer about besides the rapid improvement of Daniel Johnson. Johnson (16.5 points and 7.7 rebounds) boosted his numbers from 10.0 points and 4.0 rebounds to become the 36ers’ second-highest scorer, earning him the NBL Most Improved Player award at season’s end.
Diamon Simpson played one season in the NBL. He averaged 14.3 points, 8.6 rebounds, and 0.9 assists in 27 NBL games.
| SEASON | AGE | TEAM | TEAM RECORD | GP | MINS | PTS | REB | AST | OR | DR | STL | BLK | TO | PF | FGM | FGA | FG% | 3PM | 3PA | 3P% | FTM | FTA | FT% | TS% | EFG% | HS |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2011-12 | 24 | Adelaide | 8-20 (9) | 27 | 665 | 387 | 233 | 24 | 100 | 133 | 23 | 41 | 49 | 73 | 155 | 262 | 59% | 0 | 0 | 0% | 77 | 142 | 54% | 59% | 59% | 23 | Totals | 27 | 665 | 387 | 233 | 24 | 100 | 133 | 23 | 41 | 49 | 73 | 155 | 262 | 59.2% | 0 | 0 | 0.0% | 77 | 142 | 54.2% | 60% | 59% | 23 |
| SEASON | AGE | TEAM | TEAM RECORD | GP | MINS | PTS | REB | AST | OR | DR | STL | BLK | TO | PF | FGM | FGA | FG% | 3PM | 3PA | 3P% | FTM | FTA | FT% | TS% | EFG% | HS |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2011-12 | 24 | Adelaide | 8-20 (9) | 27 | 24.6 | 14.3 | 8.6 | 0.9 | 3.7 | 4.9 | 0.9 | 1.5 | 1.8 | 2.7 | 5.7 | 9.7 | 59% | 0.0 | 0.0 | 0% | 2.9 | 5.3 | 54% | 59% | 59% | 23 | Total | 27 | 24.6 | 14.3 | 8.6 | 0.9 | 3.7 | 4.9 | 0.9 | 1.5 | 1.8 | 2.7 | 5.7 | 9.7 | 59.2% | 0.0 | 0.0 | 0.0% | 54.2% | 60% | 59% | 23 |
| POINTS | REBOUNDS | ASSISTS | STEALS | BLOCKS | TURNOVERS | TRIPLE DOUBLES | 23 | 16 | 4 | 2 | 4 | 4 | 0 |
|---|
The Rockets signed Simpson to a guaranteed contract for the last eight games of the NBA season. This included a non-guaranteed contract for the 2012/13 season which Houston opted not to take up.
Simpson played games in the NBA. He averaged 0 points, 0 rebounds, and 0 assists per game over his NBA career.
Simpson joined Alaska Aces for the 2010 PBA Fiesta Conference season in the Philippines, opening with 36 points and 25 rebounds and helping Alaska win the conference title.
Simpson joined Türk Telekom Ankara for the 2010–2011 season in Turkey, averaging 7.3 points and 5.8 rebounds in four EuroChallenge games.
Simpson joined Maccabi Ashdod for the 2012–2013 Israeli Basketball Premier League season, averaging 17.6 points, 8.3 rebounds, 1.6 assists, 1.8 steals and 1.5 blocks in 27 games.
Simpson joined Ironi Nes Ziona for the 2013–2014 Israeli Basketball Premier League season, averaging 15.9 points and 7.7 rebounds in 27 games.
Simpson joined Movistar Estudiantes for the 2014–2015 Liga Endesa season in Spain, averaging 8.9 points and 4.6 rebounds across 34 games.
Simpson returned to Ironi Nes Ziona for the 2015–2016 Israeli Basketball Premier League season, averaging 15.6 points, 10.7 rebounds and 2.4 assists in 21 games.
Simpson rejoined Movistar Estudiantes in March 2016 for the 2015–2016 Liga Endesa season in Spain, averaging 9.5 points and 5.1 rebounds in 13 games.
Simpson joined CEZ Nymburk for the 2016–2017 season in the Czech Republic, won the 2017 Czech National Cup and averaged 9.9 points and 6.2 rebounds in 14 Basketball Champions League games.
Simpson joined Maccabi Tel Aviv in February 2017 for the EuroLeague season in Israel, averaging 9.2 points, 6.7 rebounds, 1.5 steals and 1.0 blocks in six EuroLeague games.
Simpson joined Trotamundos de Carabobo in May 2017 for Venezuela’s Liga Profesional de Baloncesto, playing eight games and recording 13 points, 13 rebounds and two blocks against Guaros de Lara on June 8.
Simpson joined Büyükçekmece Basketbol for the 2017–2018 season in Turkey, averaging 8.8 points and 7.1 rebounds in 30 Turkish league games.
Simpson returned to Alaska Aces in 2018 for the PBA Commissioner’s Cup in the Philippines, leaving the club on October 3 after the season.
Simpson signed with Avtodor Saratov for the 2018–2019 season in Russia on August 26, 2018, then left on October 2 before appearing in a game because of a back injury.
Simpson joined Maccabi Rishon LeZion for the 2018–2019 Israeli Basketball Premier League season, averaging 9.8 points and 6.7 rebounds and recording 28 points and 20 rebounds in a 92–86 semifinal win over Hapoel Jerusalem.
Simpson returned to Alaska Aces for the 2019 PBA Commissioner’s Cup in the Philippines on June 27, 2019, and posted 15 points, 19 rebounds and four assists in a 108–72 win over TNT.
Simpson joined Ironi Nahariya for the 2019–2020 Israeli Basketball Premier League season on January 7, 2020, averaging 11.7 points, 7.1 rebounds and 1.5 blocks in 14 games.
Simpson joined Quimsa for the 2020–2021 Liga Nacional season in Argentina, averaging 11.2 points and 7.9 rebounds in 30 league games and adding 12.3 points and 7.0 rebounds in four Basketball Champions League Americas games.
Simpson joined Plateros de Fresnillo for the 2021 Liga Nacional de Baloncesto Profesional season in Mexico, averaging 9.8 points and 7.6 rebounds in 10 games.
Simpson returned to Maccabi Rishon LeZion for the 2021–2022 Israeli Basketball Premier League season, averaging 9.8 points and 8.1 rebounds in 19 games.
Simpson returned to Trotamundos de Carabobo for the 2022 Venezuelan SLB season, playing four games and averaging 6.0 points, 5.0 rebounds and 2.3 blocks.
Simpson joined Dorados de Chihuahua for the 2022 Liga Nacional de Baloncesto Profesional season in Mexico on September 21, recording 11 points, eight rebounds and two assists in one game.
Simpson joined Riachuelo de la Rioja for the 2022–2023 Liga Nacional season in Argentina, averaging 8.9 points and 6.5 rebounds in 25 games.
Simpson joined Peñarol Mar del Plata for the 2023–2024 Liga Nacional season in Argentina, averaging 9.8 points, 9.2 rebounds and 1.4 blocks in 30 games.
Simpson joined Barcelona Sporting Club for the 2024 Liga Básquet Pro season in Ecuador, debuting in a 72–66 win over San Antonio Gold and later posting 19 points and 17 rebounds in a 98–93 overtime quarterfinal win over Importadora Alvarado.
Diamon Simpson attended the Saint Mary's College of California and played for the Saint Mary's Gaels in the NCAA's West Coast Conference (WCC) between 2005 and when he graduated in 2009, appearing in a school-record 128 games during a four-year stretch in which the Gaels went 87–41 overall.
As a freshman in 2005–06, Simpson played 29 games (one start) and averaged 8.2 points, 6.9 rebounds, 0.5 assists, 1.1 steals and 1.5 blocks in 21.6 minutes per game while shooting 48.6% from the field and 56.4% at the line, earning West Coast Conference All-Freshman Team recognition and finishing in the WCC’s top five in rebounding (6.9 per game) while ranking among the league leaders in blocked shots (45).
In that 2005–06 season he logged 217 points and 201 rebounds, produced two double-doubles, grabbed a freshman-best 16 rebounds against San Francisco (including 10 offensive boards in the first half), and set single-game freshman highs of five steals and four blocks against San Diego while also hitting 12 free throws against Pepperdine (including 10 straight).
As a sophomore in 2006–07, Simpson started all 32 games and became Saint Mary’s leading scorer and rebounder at 14.1 points and 7.7 rebounds per game, adding 0.9 assists, 1.3 steals and 2.5 blocks per game while shooting 48.3% from the floor and earning All-WCC First Team honors, WCC Player of the Month for January, three WCC Player of the Week awards, and Shamrock Office Solutions Classic MVP after a season in which he totaled 452 points, 245 rebounds, 79 blocks and 43 steals.
That 2006–07 season included a career-high 29 points and 11 rebounds in an 80–75 win over Gonzaga (Jan. 15), five 20-point games, a career-high eight blocks against Pepperdine (Jan. 27), and national placement among the country’s blocked-shot leaders as his 79 rejections accounted for nearly half of Saint Mary’s team blocks (174).
As a junior in 2007–08, Simpson again started every game (32) and averaged 13.4 points, 9.6 rebounds, 1.1 assists, 1.2 steals and 1.8 blocks in 30.8 minutes per night while shooting 54.5% from the field, and he was named WCC Defensive Player of the Year and First Team All-WCC as Saint Mary’s surged to a 25–7 record (12–2 WCC) and reached the NCAA tournament as a No. 10 seed before falling 78–64 to No. 7 seed Miami in the first round.
Across that 2007–08 campaign he posted 13 double-doubles, scored in double figures in 25 of 32 games, and delivered a season-best all-around line against Kent State with 24 points, 15 rebounds, three steals and three blocks, while also recording 18 points and 12 rebounds against then-No. 11 Oregon and matching a then-career best of 16 rebounds against San Diego State.
As a senior in 2008–09, Simpson was a teammate of Australian and Portland Trail Blazers backup point guard Patrick Mills when playing for the Gaels from 2007–2009, and he started all 35 games to finish as a three-time First Team All-WCC selection while repeating as WCC Defensive Player of the Year, collecting NABC All-District 9 Second Team recognition, earning CollegeHoops.net Fourth Team High Mid-Major honors, and compiling a double-double average of 13.8 points and 10.8 rebounds per game (377 total rebounds) while shooting 50.5% from the field and adding 0.6 assists, 1.7 steals and 1.6 blocks per game.
During that 2008–09 season he was one of 18 players nationally to average a double-double and his 10.8 rebounds per game ranked 11th in the country, he was WCC Player of the Month for November, he won tournament MVP at the Shamrock Office Solutions Classic after averaging 18.0 points, 11.5 rebounds, 6.0 blocks and 2.5 steals across the event, and he was twice named WCC Player of the Week (Dec. 15 and Dec. 29), giving him seven career WCC weekly awards (second all-time in league history).
Simpson’s senior-year peaks included a season-high 24 points on 7-of-9 shooting against Pepperdine (Jan. 17), a career-best 18 rebounds against Oregon, a season-high seven blocks against Morgan State, and a career-high six steals against Portland in the WCC tournament semifinals, and on Jan. 2, 2009 he broke Saint Mary’s all-time rebound record with nine boards against Cal State Bakersfield to push his career total to 1,130 rebounds.
Saint Mary’s finished 28–7 (10–4 WCC) in Simpson’s final season and reached as high as No. 22 in the AP poll during the year, and after the WCC tournament the Gaels made an NIT run that included home wins over Washington State (68–57) and Davidson (80–68) before a 70–66 loss at San Diego State, with Simpson later adding postseason exposure in events such as the Hershey’s Senior All-Star game and the Portsmouth Invitational Tournament (13.8 points and 10.7 rebounds per game there) before closing his college career as Saint Mary’s all-time leader in rebounds (1,130), blocked shots (239), steals (174), free throws made (470) and free throws attempted (777), while also totaling 1,603 points and 37 career double-doubles.
After a 15-year professional playing career, Diamon Simpson moved into coaching with the Capital City Go-Go.
In October 2024, Simpson was appointed an assistant coach with the Washington Wizards' NBA G League affiliate, marking his first official coaching position.
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