David Adiv is Royler Gracie's Black Belt Instructor for the United States.  David's journey in the martial arts spans over 20 years.  He was first introduced into the martial arts through the study of Judo, in which, he went on to hold many international titles.  Later, while teaching Judo in the United States, David had the opportunity to meet and train with Rickson Gracie. Rickson took note of David's martial arts prowess and immediately put him in contact with Royler.  In 1992, David began his training under Royler Gracie by going  to Brazil.  From then on David would spend six months out of each year training in Brazil. In 1995, Royler invited David to be part of his training team and accompany him and Rickson Gracie for Royler's first Vale Tudo match in Japan. Since then, he has traveled with Royler as part of his training team. On his own, David is accomplished in Brazilian Jiu-Jitsu, competing in various tournaments including the Pan American Championships in 1996 and the first Rickson Gracie International Tournament where he not only won his division but also walked away with the award for the most technical fighter. He has competed in the Mundials (The Worlds) and done extremely well.  As an instructor, David teaches all aspects of Brazilian Jiu-Jitsu from the self-defense aspect to Sport Jiu-Jitsu, Submission Wrestling and on to Vale Tudo. He is considered by many to be one of the most technical black belts today.
 

--taken from www.RoylerGracie.com