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?
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. Royler Gracie: Royler Gracie (born December 6, 1965) is a retired Brazilian-American mixed martial artist and Brazilian jiu-jitsu practitioner. Royler Gracie:  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.
Royler Gracie