Question: A Brazilian Jiu-Jitsu practitioner is affiliated with a martial arts school located where?

Context paragraphs:
Mariusz Linke: Mariusz Ryszard Linke (born July 31, 1969) is a Polish professional mixed martial artist and grappler who is most notable for being the first Polish born black belt in Brazilian jiu-jitsu, the highest ranking active Polish judoka and BJJ practitioner in both mixed martial arts and grappling, and one of the most decorated grapplers in Poland, he is also the first Polish grappler to travel to Brazil and receive training under a Gracie trained Brazilian jiu-jitsu black belt.  Linke has notably competed in the European Championship, NAGA, Grapplers Quest, ADCC and the Pan American Games.  Linke is currently in talks with top Polish promotion Konfrontacja Sztuk Walki to negotiate a 2 fight contract to close out his mixed martial arts career by the end of 2015, Linke has stated despite retiring from fighting he will still continue his grappling career and is rumored to be in the 2014 ADCC Polish Trials to enter the 2015 ADCC World Championship.

John-Olav Einemo: John-Olav Einemo (born 10 December 1975) is a retired Norwegian mixed martial artist.  He is also a Brazilian Jiu-Jitsu practitioner, with the highlight of his career being the win in the ADCC Submission Wrestling World Championship in 2003 (88–98 kg weight class).  He is the only man to defeat multiple-time BJJ champion Roger Gracie in the ADCC Submission Wrestling World Championship tournament.  He holds a black belt in Brazilian Jiu-Jitsu.

Alvin Aguilar: Arthur Alvin A. Aguilar is a martial artist and Mixed Martial Arts promoter better known as "Alvin Aguilar".  He was born on April 28, 1974 in Bacolod, Philippines.  He is the president and founder of the The Universal Reality Combat Championship (URCC, 2002–present); He is also the founder and head coach of DEFTAC Ribeiro Jiu-jitsu Philippines (DEFTAC, 1996–present.)  and now currently serving as the president of the Wrestling Association of the Philippines.  He started training in martial arts at the age of 9, first in Karate, Arnis and Greco-Roman Wrestling.  Having spent over 30 years of his life to the study of multiple martial arts forms including Sari-an, Brazilian Jiu-Jitsu, Yaw Yan, Pekiti, etc.  He has developed his own unique fighting style specializing in grappling, knife and street fighting.  He is also known for being the first home-grown Filipino Brazilian Jiu-jitsu Black belt.

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.

Brazilian jiu-jitsu ranking system: The Brazilian jiu-jitsu ranking system is a means of signifying a practitioner’s increasing levels of technical knowledge and practical skill within the art of Brazilian jiu-jitsu.  Colored belts that are worn as part of the uniform are awarded to the practitioner.  While the ranking system's structure shares its origins with the Judo ranking system and that of all colored martial arts belts, the Brazilian jiu-jitsu ranking system grew to incorporate unique aspects and themes.  The system has minor differences from Judo in areas such as a division between youths and adults and the issuance of stripes and degrees.  Some distinct differences have become synonymous with the art, such as a marked informality in promotional criteria, a focus on a competitive demonstration of skill, and a conservative approach to promotion.

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.

Renzo Gracie: Renzo Gracie ( ; ] ; born March 11, 1967) is a Brazilian mixed martial artist and Brazilian Jiu-Jitsu practitioner.  A member of the Gracie family of Brazil, Renzo is a 6th Degree Black in Brazilian Jiu-Jitsu under Carlos Gracie Jr..  He is the son of Robson Gracie, grandson of Carlos Gracie, nephew of Carlos Gracie, Jr. grandnephew of Helio Gracie, and the 1st cousin once removed of Royce Gracie.  In mixed martial arts, Renzo has competed in the Ultimate Fighting Championship, Pride Fighting Championships, K-1, RINGS, and International Fight League (head-coaching the New York Pitbulls).  He holds notable victories over five former UFC Champions: Frank Shamrock (UFC Light Heavyweight Champion), Carlos Newton (UFC Welterweight Champion), Pat Miletich (UFC Welterweight Champion), Maurice Smith (UFC Heavyweight Champion), and Oleg Taktarov (UFC 6 Tournament Winner)

Keenan Cornelius: Keenan Kai-James Cornelius is an American Brazilian Jiu-Jitsu practitioner known for his competitive achievements, most notably including what has been dubbed a grand slam in Brazilian Jiu-Jitsu, having won double gold medals at four major tournaments - the World Jiu-Jitsu Championship, Pan-American Championship, European Open Championship, and Brazilian National Jiu-Jitsu Championship - at his given belt rank

B.J. Penn: Jay Dee "B.J." Penn (born December 13, 1978) is an American professional mixed martial artist and Brazilian Jiu-Jitsu practitioner.  Penn debuted and competed in the Ultimate Fighting Championship (UFC), and later in K-1.  Prior to fighting for the UFC, he became the first American Gold medalist of the World Jiu-Jitsu Championship.  In mixed martial arts, Penn has competed in the Featherweight, Lightweight, Welterweight, and Middleweight divisions.  As a former UFC Lightweight Champion and UFC Welterweight Champion, he is one of only three fighters in UFC history to win titles in multiple weight classes.  Penn was also a Co-champion in the UFC 41 Lightweight Tournament, due to an eventual draw opposite Caol Uno in the tournament finale.  Through his tenures as champion, Penn unofficially unified the UFC Lightweight Championship (against Sean Sherk) and broke the all-time lightweight title defense record.  Penn was inducted into the UFC Hall of Fame, as the inaugural inductee in the Modern-Era Wing by career-long rival Matt Hughes, during "International Fight Week" in July 2015.

Mackenzie Dern: Mackenzie Lynne Dern (born March 24, 1993) is a Brazilian Jiu-Jitsu practitioner and mixed martial artist.  IBJJF ranks Mackenzie as the number one female black belt in brazilian jiu-jitsu.  She holds a black belt under her father, Wellington "Megaton" Dias who is one of the top Brazilian jiu-jitsu black belts in the world.  She is an ADCC and no gi BJJ (black belt) World Champion.

Supporting paragraphs: ZenQuest Martial Arts Center Demian Maia
Answer: Lenox, Massachusetts