Question: What former leader of the Gracie Humaitá school in Rio de Janeiro, Brazil, with the help of his father, demonstrated the Ashi-Hishigi in several medias?

Context paragraphs:
Gracie Humaitá: Gracie Humaitá or Academia Gracie de Jiu-Jitsu is a Brazilian Jiu-Jitsu academy on Humaitá Street, in Botafogo, Rio de Janeiro, Brazil, founded by Carlos Gracie.  The Academy offers classes in Gracie Jiu-Jitsu.

Greater Rio de Janeiro: Greater Rio de Janeiro, officially Rio de Janeiro Metropolitan Region ("Grande Rio", officially "Região Metropolitana do Rio de Janeiro", in Portuguese) is a large metropolitan area located in Rio de Janeiro state in Brazil, the second largest in Brazil and third largest in South America.  It consists of 21 municipalities, including the capital of the State, Rio de Janeiro.

Mauricio Villardo: Mauricio Villardo Reis (born January 14, 1975) best known as Mauricio Villardo is a fourth-degree black belt in Brazilian Jiu-Jitsu under Royler Gracie, head instructor of Gracie Humaitá and he is also a former World Champion of the World Jiu-Jitsu Championship of the International Brazilian Jiu-Jitsu Federation (IBJJF).  Living close to the beautiful beaches in Brazil, Mauricio's hobby was surfing, but once he experienced Jiu-Jitsu, he fell in love with the sport.  Mauricio’s first experience with the martial arts was not Jiu-Jitsu.  When he was seven,he began practicing Judo at Clube do Flamengo,in Rio de Janeiro.

Rio de Janeiro: Rio de Janeiro ( ; ] ; "River of January"), or simply Rio, is the second-most populous municipality in Brazil and the sixth-most populous in the Americas.  The metropolis is anchor to the Rio de Janeiro metropolitan area, the second-most populous metropolitan area in Brazil and sixth-most populous in the Americas.  Rio de Janeiro the capital of the state of Rio de Janeiro, Brazil's third-most populous state.  Part of the city has been designated as a World Heritage Site, named ""Rio de Janeiro: Carioca Landscapes between the Mountain and the Sea"", by UNESCO on 1 July 2012 as a Cultural Landscape.

Carlos &quot;Caique&quot; Elias: Carlos Henrique "Caique" Elias (born October 30, 1957) is a 7th degree red-and-black belt master of Brazilian Jiu-Jitsu (BJJ).  After starting his martial arts training in judo at age 15, he began training in 1975 with the Gracie family at the original Gracie Humaitá academy in Rio de Janeiro, Brazil.  In 1982, Elias became one of only eight non-Gracies ever to receive his black belt directly from Hélio Gracie.

Royler Gracie: Royler Gracie (born December 6, 1965) is a retired Brazilian-American mixed martial artist and Brazilian jiu-jitsu practitioner.  He ran the Gracie Humaitá school in Rio de Janeiro, Brazil for many years under his father Helio's direction, but currently lives in San Diego.

Ashi-Hishigi: Ashi-Hishigi also called an Achilles lock or simply an ankle lock, is a technique described in both "The Canon Of Judo" by Kyuzo Mifune and "Brazilian Jiu-Jitsu, Theory and Technique" by Renzo Gracie and Royler Gracie as well as demonstrated in the video, The Essence Of Judo.  It is classified as a joint lock (Kansetsu-waza), and is not a recognized technique of the Kodokan.  However, It is a commonly used technique in both Brazilian Jiu-Jitsu tournaments and Mixed martial arts competition.

José Freitas Siqueira, Jr: José Freitas Siqueira, Jr was born in Miracema, Rio de Janeiro, Brazil, in 1967.  He received his DDS from Gama Filho University, Rio de Janeiro in 1989, and his endodontic certificate from Federal University of Rio de Janeiro in 1992.  In 1996, he received his Master’s Degree in Microbiology and Immunology from Federal University of Rio de Janeiro.  He concluded his PhD in Microbiology and Immunology in 1998 at Federal University of Rio de Janeiro.  Since 2015, is one of the Coordinators of the health in dental area of FAPERJ (Foundation for Research Support of the State of Rio de Janeiro, Brazil).  Currently, is the Chairman of Endodontics, Director of the Postgraduate Program in Endodontics and Head of the molecular microbiology laboratory at Estácio de Sá University, in Rio de Janeiro, Brazil, also an associate researcher at Federal University in Rio de Janeiro.

Wellington &quot;Megaton&quot; Dias: Wellington Leal "Megaton" Dias is a Brazilian jiu-jitsu (BJJ) practitioner, and an official black belt representative of the Royler Gracie Jiu-Jitsu Association.  Wellington originally trained under Rogerio Camoes and later at the legendary Gracie Humaitá jiu-jitsu school in Rio de Janeiro.  Wellington received his black belt at the age of 18.  Wellington is currently a fifth degree black belt under Royler Gracie.

Rio de Janeiro Cathedral: The Metropolitan Cathedral of Saint Sebastian (Portuguese: Catedral Metropolitana de São Sebastião ) better known as the "Metropolitan Cathedral of Rio de Janeiro" ("Catedral Metropolitana do Rio de Janeiro )" or as the Cathedral of St. Sebastian of Rio de Janeiro ("Catedral de São Sebastião do Rio de Janeiro" ), is the seat of the Roman Catholic Archdiocese of São Sebastião do Rio de Janeiro.  The cathedral is the See of the Metropolitan Archbishops of the city of Rio de Janeiro, Brazil.  The church is dedicated to Saint Sebastian, the patron saint of Rio de Janeiro.

Supporting paragraphs: Ashi-Hishigi Royler Gracie
Answer: Royler Gracie