محمد بن زايد آل نهيان
Gracie has co-written two instructional books on jiu-jitsu; "Brazilian Jiu-Jitsu: Theory and Technique" with his cousin Royler Gracie, and "Mastering Jujitsu" with training partner John Danaher. He has also been the personal jiu-jitsu teacher of Sheikh Mohammed bin Zayed Al Nahyan, Crown Prince of Abu Dhabi, since 1993.