Leon was born on May 6, 1995, in Harrow, Essex County, Ontario, Canada.[1] He grew up playing ice hockey then was introduced to martial arts and boxing by his father when he was 6.[1][3] Leon started Brazilian jiu-jitsu (BJJ) in Detroit, Michigan, from the age of 12.[1][3] His first instructor was the late Dean Hersche.[1] As a blue belt Leon won the IBJJF World Juvenile Championship twice (2012, 2013) the IBJJF Pans Championship and the IBJJF Pans Juvenile Championship.[4]
After being promoted to purple belt Leon won the 2015 IBJJF Pans No-Gi Championship under the Gracie Humaitá/Ribeiro Jiu-Jitsu team.[1][3] Leon then joined GFTeam under Abraham Marte and Vitor Oliveira. After getting his brown belt, he moved to Toledo, Ohio, to train full time.[1][3] As a brown belt Leon won the World No-Gi Championship as well as Pan No-Gi. In 2017 he won silver at the IBJJF World Championship.[4]
Black belt career
2017–2020
In June 2017, Leon was promoted to black belt by Júlio César Pereira and Oliveira,[1] that same year Leon won the American No-Gi Nationals and the IBJJF Pans No-Gi.[4] At the 2018 World No-Gi Championship, Leon won bronze after reaching the semi-finals before losing to Hugo Marques.[1] In 2019, he became black belt No-Gi World champion for the first time, after defeating Jaime Canuto 4x2 in the finals.[1]
Competing in the KASAI Elite Grappling Championships, Leon defeated Edwin Najmi via rear naked choke on April 6, 2019, during Kasai Pro 5.[1][5] On February 1, 2020, at Kasai Pro 7, Leon defeated Renato Canuto via points.[1][6]
2021–2022
In 2021, Leon finished second of No-Gi World after losing to Marques by referee decision in the final.[1] In October 2021, Leon announced he would be officially joining Pedigo Submission Fighting to compete under their banner.[2][7]
At the 2022 ADCC World Championship, Leon defeated Magid Hage and Mateusz Szczecinski before losing to Micael Galvão in the semi-finals.[1][8] He won the bronze medal match by defeating PJ Barch.[1][8] In 2022 Leon became No-Gi World champion for the second time after defeating Carlos Henrique 2 points 0 in the final.[1]
2023
On February 26, 2023, Leon won the middleweight division and the absolute division at the IBJJF Tampa International Open.[9] Leon was then booked to compete at Who's Number One 18: Meregali v Marinho on May 18, 2023, against Ruan Alvarenga.[10] Leon won the match, submitting Alvarenga with a rear-naked choke.[11] Leon competed in the IBJJF Indianapolis no gi Open on June 18, 2023, and won a gold medal in the medium-heavyweight division.[12]
Leon competed against Ethan Crelinsten for the vacant WNO lightweight title at Who's Number One 19 on August 10, 2023.[13] He won the match by submission and became the new WNO lightweight world champion.[14] Leon then entered the super-heavyweight division of the IBJJF No Gi Pan Championship 2023 on October 1, 2023, and won a gold medal.[15] Leon then won the no gi middleweight division at the IBJJF Nashville Fall Open 2023 on November 12, 2023.[16]
Leon represented Team Modolfo in the under 76kg division at AIGA Champions League Final 2023 on December 13 and 14.[17] He won his semi-final match by submission[18] and his final match by submission to help Team Modolfo win the tournament.[19] Leon was voted MVP of AIGA Season 2 as a result,[20] and later won 'Male Grappler of the Year (No Gi)' at the JitsMagazine BJJ Awards 2023.[21]
2024
Leon was booked to defend his WNO lightweight title against Diego 'Pato' Oliveira at Who's Number One 22 on February 9, 2024.[22] He was submitted with a heel hook and lost the title.[23]
Leon competed in the IBJJF No Gi Absolute Grand Prix on February 29, 2024.[24] He beat Elder Cruz in the opening round before losing to eventual champion Kaynan Duarte in the semi-final.[25] He then won a gold medal in the middleweight division and a silver medal in the absolute division at the IBJJF No Gi American National Championship 2024 on June 29, 2024.[26]
Leon was then invited to compete in the 2024 ADCC World Championship on August 17-18, 2024.[27] He lost on points to Elijah Dorsey in the opening round.[28] Leon returned in the men's absolute division, where he beat Michael Perez and Micael Galvão before losing to Kaynan Duarte in the semi-final. He then beat Giancarlo Bodoni in the third-place match to win a bronze medal.[29]
Leon faced Andy Varela at UFC Fight Pass Invitational 8 on October 10, 2024.[30] He won the match by submission. [31]
Leon competed against Ellis Younger at Polaris 30 on November 2, 2024.[32] He won the match by decision.[33]