Hassan first gained prominence as a competitor on the second season of WWE's reality television show Tough Enough. Although he was eliminated from the competition in the semi-finals, Hassan signed a developmental deal with WWE and was assigned to Ohio Valley Wrestling (OVW). He made his debut in OVW under the ring name Muhammad Hassan and eventually won the OVW Heavyweight Championship.
In late 2004, Hassan debuted on the main WWE roster as a villainous character. He played the role of a radical Muslim American and engaged in several controversial storylines that involved anti-Arab sentiment. In one storyline, Hassan aligned himself with The Undertaker and faced off against The Rock at WrestleMania 22.
Hassan's run with WWE came to an end in November 2005 after he made controversial remarks about the terrorist attacks of September 11, 2001. He was subsequently released by WWE and went on to compete for several independent wrestling promotions. He also returned to mixed martial arts, competing for several promotions, including K-1 and Bellator.
In 2017, Hassan returned to WWE as a trainer at the WWE Performance Center. He has since been involved in several behind-the-scenes roles with WWE, including serving as a producer for WWE NXT.
In addition to his wrestling and MMA career, Hassan is also an outspoken advocate for the Muslim American community. He has been involved in several organizations that promote interfaith dialogue and understanding, and he has spoken publicly about his own experiences as a Muslim American in the United States.