Shihan David Colon Shihan Colon has over 25 years of Martial Arts experience and currently holds a 9th Degree Black Belt in Jujutsu and is Dai Shihan under the tutelage of Shinan Hector Negron, founder of San Yama Bushi Jujutsu.  Shihan Colon’s martial arts studies have also included Iaido (Japanese Swordsmanship) and Judo.  In his Professional life Shihan Colon is a Social Worker for the City of New York.  Shihan Colon holds a BA in Psychology from Fordham University.  He is the head Jujutsu Instructor at UBA. Sensei Jose Guerrero Sensei Guerrero has over 25 years of Martial Arts experience and holds a 3rd Degree Black Belt in Karate and a 4th Degree Black Belt in Jujutsu. He has trained in Karate under the late Shihan William Oliver at the original Upper West-Side Seido Dojo and has also competed as a member of the 1994 World Seido Team. He continued his studies of martial arts and trained in Jujutsu under Shihan Hector Negron of the San Yama Bushi Dojo in New Rochelle, NY.  Sensei Guerrero was also a Martial Arts/Boxing Instructor at New York Sports Club ("NYSC") and the New York Athletic Club.  He has also worked as a Credit Analyst for Nations Bank.   Sensei Guerrero attended Albany State University.  He is currently a Sergeant in the NYPD and head Karate Instructor at UBA. Sensei Manny Cofresí Jr. Sensei Cofresí has over 20 years of Martial Arts experience and holds a 5th Degree Black Belt in Jujutsu under the tutelage of Shinan Hector Negron, founder of San Yama Bushi Jujutsu.   Sensei Cofresí began his martial arts studies first in the practice of Shorinji Kempo Karate.  In his professional life he is currently Vice President, Corporate Development for Automatic Data Processing Inc.  Prior to ADP Sensei Cofresí was a Vice President at two large Wall Street Investment Banks:  Merrill Lynch and Citigroup. Sensei Cofresí has also worked at Apple  and Motorola Inc.  Sensei Cofresí holds an MBA from Stanford's Graduate School of Business and a B.S. in Electrical Engineering/Device Physics from Cornell University's College of Engineering. Shihan Mark Sternefeld Shihan Mark Sternefeld has over 35 years of Martial Arts experience and holds a Black Belt in Kenpo Karate and a 8th Degree Black Belt in Jujutsu under the tutelage of Shinan Hector Negron, founder of San Yama Bushi Jujutsu.  In his professional life Shihan Sternefeld is a successful entrepreneur involved in various ventures and a decorated Retired Police Officer in the New York Police Department (“NYPD”).  He was also a NY/NJ Port Authority Police Officer, a Federal Officer in the US Bureau of Prisons and a Detective Investigator for the Brooklyn District Attorney.  Shihan Sternefeld graduated from Manhattan College and attended Graduate School at Long Island University.