Our Instructors & Staff Members

Sheldon Marr  (Chief Instructor/Owner) Sheldon Marr is a former Judo and Wrestling Champion, and has been involved in the Martial Arts for 45 years. "Coach" Marr has been inducted into the Jujitsu America, U.S Martial Arts, World Martial Arts & International Black Belt Halls of Fame as the "Instructor of the Year". Marr was a Coach of the U.S. Pankration Team for the 2000 World Championships, the U.S. Grappling Team for the 2007, 2008, 2009 & 2010 World Championships, and has coached National and International Champions in Jiu Jitsu, Pankration, Submission Wrestling, Judo, Wrestling and MMA.

Nick Marr  (Manager/Instructor) Nick Marr is a Certified MMA Conditioning Coach, a 5X U.S. National Submission Wrestling/Jiu Jitsu Champion (3X teen, 2x Men's Flyweight), and a former Colorado State Freestyle Wrestling Champion. Besides being the Manager of Grappler's Edge, Nick is also one of our top Grappling Coaches, and runs our "Edge Body Boot Camp" Classes.

Grappling Staff Thiago Detanico - Black Belt - 2006 U.S National Submission Wrestling Lightweight Champion. Started his training in Brazil directly under World Famous BJJ and Vale Tudo Champion Mario Sperry, and has been at Grappler's Edge since 2004. Mike Nuss - Black Belt - Former Collegiate All-American Wrestler. 1976 Olympic Freestyle Wrestling Team Trials Competitor. Eric Koble - Black Belt - 5X U.S. National Jiu Jitsu/Grappling Champion. Former Iowa University Wrestler (member of 4 NCAA National Championship Teams). 2X ADCC North American Team Trials & 2003 ADCC World Championshps Competitor. Scott Marshall - Black Belt - 5X U.S. National Jiu Jitsu/Grappling Champion. Former University of Pennsylvania Wrestler. Invited to compete in the 2003 ADCC World Championshps. Jim Wonhof - Black Belt - 4X U.S. National Jiu Jitsu/Grappling Champion (7X medalist). Has trained under Coach Marr for over 20 years. Steve Stobaugh - Black Belt - U.S. National Jiu Jitsu Champion. Former University of Cincinnati and U.S. Army Wrestler. Bert Griggs - Black Belt - U.S National Jiu Jitsu and Judo Champion. Jim Bacon - Black Belt - U.S. National Jiu Jitsu and Judo Champion. Between the ten of them: Marr, Marr, Detanico, Nuss, Marshall, Koble, Wonhoff, Stobaugh, Griggs and Bacon have over 230 years of experience in the Grappling Arts (and Marr, Griggs and Bacon are all former members of the U.S. Olympic Judo Training Squad).

Tom Yoshida  (Kickboxing Coach) Tom Yoshida has cross trained in many Martial Arts and is a black belt in Judo and Karate. Tom is a 4X All-Japan Muay Thai Kickboxing Champion, and is the Head Kickboxing Coach at Grappler's Edge... taking our MMA program to the next level. Tom has trained and coached many Champions in kickboxing, including World Champion Duane "Bang" Ludwig.

Jess Zobeck  (Wrestling Coach) Jess Zobeck was a 3X State Place Winner in High School (in Iowa), an All-American for Iowa Central, and a three-year letterman at the University of Iowa. Jess qualified to compete in the 2005 U.S. World Freestyle Team Trials and trained for the 2008 U.S. Olympic Freestyle Wrestling Team at the U.S. Olympic Training Center in Colorado Springs.

Chad Kroupensky  (Boxing Coach) Chad Kroupensky learned to love and appreciate boxing at a local Boy's Club in Michigan, where he trained and sparred with several State and National Amatuer Champions. Chad fought in a handful of "Smokers" while in the U.S. Marine Corps, and also trained with, sparred, and cornered several bouts for All-Marine Boxing Team Members. Chad apprenticed under Scott Ardrey, and was hand-picked by Scott to assume training duties at Edge Boxing.

Ricardo Murgel  (BJJ Technical Advisor) Master Ricardo Murgel is widely considered one of the World's foremost authorities on Brazilian Jiu Jitsu, Submission Wrestling and Vale Tudo. Master Murgel is also the highest ranked Brazilian Jiu Jitsu instructor (8th Degree Black Belt) in Southern Brazil with over 40 years experience. His many accomplishments include having coached the 2001 ADCC World Submission Wrestling Championships Super Heavyweight Champion, as well as more than 30 Brazilian National, World Jiu Jitsu and Vale Tudo Champions. The Grappler's Edge Team has formed an affiliation with the Union World Fighting Team, under Master Murgel and Master Flavio Behring.

Scott Ardrey  (Boxing Advisor) Scott Ardrey is known as "Boxing's Trainer of Champions". Scott has been active in the Boxing community for over 3 decades. He served as a Boxing Instructor at the 20th Street Gym for 11 years, and as the Athletic Director at the Southwest Community Center for 2 years. His many awards include being named USA Boxing National Coach (3 Times), National Golden Gloves Coach (2 Times), and the U.S. Olympic Festival Boxing Coach in 1986. Scott was also named Colorado's 1995 "Trainer of the Year" as he prepared Coloado's 1995 "Fighter of the Year" Stevie Johnston for his 1996 World Lightweight Title Fight.

For more information about the Grappler's Edge staff or training programs, please contact us at (303) 433-3343 or by clicking here.