Guilherme Mendes is a four-time IBJJF World Champion (2009, 2011, 2012, 2014) and one of the finest featherweight competitors in BJJ history. The first Atos team member to win a World Championship gold medal, he retired at just 26 to focus on coaching and was inducted into the IBJJF Hall of Fame in 2022. Together with his brother Rafael, he co-founded Art of Jiu-Jitsu Academy in Costa Mesa, California.