Context_1 : 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. Context_2 : Ralek Gracie ( ; born October 4, 1985) is an American Brazilian jiu-jitsu practitioner and mixed martial artist. As the son of Rorion Gracie, he is a member of the Gracie family, and the nephew of Legends of MMA Hall of Famer Rickson Gracie and UFC Hall of Famer Royce Gracie. He was awarded his black belt in Brazilian jiu-jitsu by his grandfather Hélio Gracie. He is also the founder of Metamoris, a submission-only grappling promotion. Context_3 : Metamoris is a Brazilian jiu-jitsu promotion, founded by Ralek Gracie, that organizes events in Los Angeles, California. Live events of Metamoris are broadcast via internet pay-per-view around the world and via premium TV at Canal Combate in Brazil. Context_4 : Gordon Ryan, is an American Brazilian Jiu-Jitsu practitioner specialising in submission only grappling. He is a ADCC world champion and a three-time Eddie Bravo Invitational champion. Context_5 : 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) Context_6 : Rener Gracie (born November 10, 1983) is an American Brazilian jiu-jitsu practitioner, a head instructor at the Gracie Jiu-Jitsu Academy, and co-creator of Gracie University. As a member of the Gracie family, he is the grandson of Grandmaster Hélio Gracie, and the second eldest son of Grandmaster Rorion Gracie, the father of Gracie jiu-jitsu in the United States. Rener is also known as the husband of actress, model and former pro-wrestler Eve Torres. Context_7 : Felipe Pena, is an American Brazilian Jiu-Jitsu practitioner.He is a ADCC world champion. Context_8 : Jonathan Torres, also known as "JT" Torres, is a Puerto Rican American Brazilian Jiu-Jitsu practitioner. He is known for a number of competitive accomplishments earned both prior to and following his promotion to black belt. Context_9 : Matthew John Serra (born June 2, 1974) is an American former professional mixed martial artist, Brazilian Jiu-Jitsu practitioner who competed for the Ultimate Fighting Championship and stand up comic. He currently serves as a UFC on FOX analyst. Serra defeated Pete Spratt, Shonie Carter and Chris Lytle en route to becoming The Ultimate Fighter 4 Welterweight Tournament Winner. He captured the UFC Welterweight Championship immediately after, becoming the first of only four to win both accolades (along with Forrest Griffin, Rashad Evans, Michael Bisping). Serra also served as the head coach for "The Ultimate Fighter 6" reality show opposite Matt Hughes. In Brazilian Jiu-Jitsu, Serra holds a Silver Medal in the ADCC Submission Wrestling World Championship. Context_10 : 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 fact_1 : Metamoris is a Brazilian jiu-jitsu promotion, founded by Ralek Gracie, that organizes events in Los Angeles, California. fact_2 : Ralek Gracie ( ; born October 4, 1985) is an American Brazilian jiu-jitsu practitioner and mixed martial artist. Answer: Ralek Gracie
Output: Which American Brazilian jiujitsu practitioner born on October 4, 1985, founded Metamoris?