Oliver Taza was born in Beirut, Lebanon, in 1993. After relocating with his family first to Saudi Arabia and then settling in Canada at age 14, Taza initially pursued football (soccer). His athletic journey took a decisive turn when he discovered mixed martial arts and Brazilian Jiu-Jitsu, marking the beginning of his dedicated path in combat sports.

Taza began his Brazilian Jiu-Jitsu training at Tristar Gym, under the renowned guidance of Firas Zahabi. Demonstrating exceptional talent and dedication, he quickly advanced through the ranks, earning his purple belt under Zahabi. In June 2016, after less than two and a half years of training, Taza received his brown belt. His rapid progression continued, culminating in his promotion to black belt by legendary coach John Danaher on November 9, 2020.

Oliver Taza gained widespread recognition as a key member of the elite Danaher Death Squad, a group celebrated for their innovative no-gi submission grappling techniques. Following the team's split in 2021, Taza remained under the mentorship of John Danaher. After briefly training in Puerto Rico, he relocated from New York City to Austin, Texas, becoming a founding member of Danaher's new academy, New Wave Jiu-Jitsu. Taza continues to represent New Wave in international competitions.

Internationally recognized for his aggressive and highly technical leg-lock game, Taza specializes in heel hooks and related submissions. His preferred attacking position is the 'Saddle' (Cross Ashi Garami), from which he consistently initiates precise and effective leg attacks. This focused specialization has established Taza as one of the most feared leg-lock practitioners on the competitive grappling circuit.

Although primarily known for his no-gi accomplishments, Taza strategically integrates gi training into his regimen. He believes that training and competing in the gi sharpens his overall grappling skills, particularly in preparation for prestigious no-gi tournaments such as ADCC. To further refine his technique and tactical approach, Taza regularly competes in IBJJF gi events, testing himself against top-tier opponents.

Oliver Taza first drew significant attention in the grappling community with his impressive second-place finish at the 2016 ADCC US East Coast Trials, achieved after only two years of training. His consistent podium placements at subsequent ADCC Trials solidified his reputation as an elite competitor. In 2022, Taza qualified for the 2022 ADCC World Championship at 77 kg, where he faced world-class opponents, including Mica Galvão.

Throughout his competitive career, Taza has consistently challenged himself against some of the world's best grapplers. On July 14, 2018, he faced Australian standout Lachlan Giles in a highly anticipated matchup. Additionally, Taza has competed in prestigious international events such as Polaris Invitational, Metamoris, and Sapateiro, further cementing his status within the global grappling community.