Question: ZenQuest Martial Arts Center is affiliated with an association by a Brazilian mixed martial artist who is regarded as one of the greatest what in MMA history?

Context paragraphs:
Mixed Martial Arts Pakistan: Mixed Martial Arts Pakistan (or PAK MMA) is the premiere mixed martial arts (MMA) and martial arts promotion based in Pakistan that was created in December 2007 by Bashir Ahmad to promote martial arts (and martial sports such as boxing and wrestling) styles in Pakistan with a particular focus on mixed martial arts competition.

Lee Hasdell: Lee Hasdell (born 13 December 1966) is a British martial artist, promoter and former professional kickboxer and mixed martial artist.  Hasdell is considered by many as a true pioneer of UK mixed martial arts, as he was the main driving force and innovator in the 1990s.  Hasdell promoted the first professional Mixed martial arts events in the United Kingdom and has helped develop many of the standards within the British MMA scene of today.

Vitor Vianna: Vítor Vianna is a Brazilian mixed martial artist, who has competed in mixed martial arts events in Brazil, Holland, and in the United States.  He is the #3 ranked Middleweight prospect in the world.  He is also ranked as the #69 Light Heavyweight fighter in the world by FightMatrix.com.  This ranking is due to certain Catchweight fights he has participated in.  He is also a highly decorated Brazilian Jiu-Jitsu competitor and is a; 2 time World Champion, 6 time Brazilian National Champion, 15 time State Champion, and ADCC NO GI Brazilian trials runner-up.  Vianna is signed to the Bellator Fighting Championships.

Demian Maia: Demian Augusto Maia Baptista (] born November 6, 1977) is a Brazilian mixed martial artist and Brazilian Jiu-Jitsu practitioner.  He currently fights as a welterweight for the Ultimate Fighting Championship.  As of May 20, 2017, he is #1 in the official UFC welterweight rankings.  Maia is regarded as one of the greatest grapplers in MMA history.

Renan Barão: Renan do Nascimento Mota Pegado, better known as Renan Barão, (] ) is a Brazilian professional mixed martial artist and the former UFC Bantamweight Champion.  He held one of the longest unbeaten streaks in MMA history - following a loss in his professional debut, he recorded 32 straight fights without a loss (31 victories and 1 no contest) over a span of 9 years.  During his championship reign, he was ranked as a top 3 pound for pound fighter and regarded as one of the best mixed martial artists in the world.  His nickname "Barão" (baron), which predates his athletic career, was given to him by his grandmother after a character in the 1986 Brazilian soap opera "Sinhá Moça".

Pedro Rizzo: Pedro Augusto Rizzo (] ; born May 3, 1974) is a retired Brazilian mixed martial artist, kickboxer and Muay Thai fighter who competed for the UFC, PRIDE, M-1 Global, and Affliction.  Although he never captured the UFC Heavyweight Championship, Rizzo competed for it three times and was regarded as a top contender for many years.  Coming from a Vale Tudo background, Rizzo is regarded as one of the most dangerous strikers in MMA history.  Rizzo holds notable victories over former UFC champions Mark Coleman, Dan Severn, Josh Barnett, Andrei Arlovski, Ricco Rodriguez and Ken Shamrock.

Wallid Ismail: Wallid Farid Ismail (born February 23, 1968) is a Brazilian mixed martial artist and promoter.  Ismail holds a black belt in Brazilian jiu-jitsu (BJJ) under Carlson Gracie, and is an IVC mixed martial arts world champion and BJJ Champion.  In mixed martial arts, Ismail also competed for the UFC, and PRIDE, and most of wins in the sport came by way of submission.

Ricardo Arona: Ricardo Arona (] ; born July 17, 1978) is a retired Brazilian mixed martial artist.  He has competed in PRIDE Fighting Championships and RINGS in his mixed martial arts career, and was a member of Brazilian Top Team.  He is the former RINGS Middleweight Champion, as well as the 2001 RINGS Middleweight Championship Tournament Winner, and 2005 PRIDE Middleweight Grand Prix Runner-Up.  In submission wrestling, he holds an undefeated record of 13-0, never losing a single point in a match, and is a three-time ADCC Champion.  He has notable wins in both MMA and submission grappling competition over Tito Ortiz, Jeff Monson, Renato Sobral, Vitor Belfort, Mark Kerr, Kazushi Sakuraba, Wanderlei Silva, Dan Henderson, Alistair Overeem, Murilo Rua, Jeremy Horn, Guy Mezger, and Dean Lister.

ZenQuest Martial Arts Center: ZenQuest Martial Arts Center, formerly called the Okinawan Karate School, is a martial arts school located in Lenox, Massachusetts.  The oldest martial arts school in Berkshire County, it was founded in 1972 as a dojo for Uechi-ryu karate.  The school since expanded to include other martial arts, and currently provides instruction in Shohei-ryu karate (a spin-off of Uechi-ryu), Brazilian jiu-jitsu, mixed martial arts, Muay Thai, boxing, wrestling, kobudo, and self-defense, and is the fastest growing martial arts community in Berkshire County.  The school also contains a store which provides equipment, gear, and instructional media.  It is affiliated with the Okinawan Karatedo Association, Demian Maia Jiu-Jitsu Association, and Team Sityodtong Boston, and is accredited by the North American Grappling Association.  ZenQuest has received significant coverage by regional and local media in Berkshire County, including "The Berkshire Eagle", "Berkshires' Best Buys, Business, and Beyond", and Pittsfield Cable Television, for its regular youth tournaments and seminars with high-ranking officials from the school's parent organizations.

Mohammed &quot;The Hawk&quot; Shahid: Mohammed Shahid (born July 8, 1989) is an entrepreneur and a mixed martial artist from Bahrain.  He is the CEO of KHK MMA and the President of the Bahrain based mixed martial arts organisation, Brave Combat Federation owned and supported by His Highness Sheikh Khalid bin Hamad Al Khalifa.  Mohammed Shahid was the first mixed martial artist from Bahrain to compete in global MMA events.  He was assigned a managerial role to develop mixed martial arts in Bahrain as the CEO of KHK MMA.  Bahrain established a national team alongside bringing global talent to facilitate the growth of MMA in Bahrain.

Supporting paragraphs: ZenQuest Martial Arts Center Demian Maia
Answer: grapplers