Shihan David Sheeger began his martial arts training at World Oyama Karate Headquarters in Manhattan in 1986. He was a member of the World Oyama Karate Full Contact Team from 1992-1997 and competed nationally and internationally in the Light Weight Division. He thereafter served as tournament coordinator of World Oyama knockdown tournaments in New York. He has also been a referee in international knockdown tournaments and served as chief referee in knockdown tournaments in New York. He began teaching regularly at World Oyama Headquarters in 1998.