Can you please introduce yourself to the Swedish grappling community? My name is Mackenzie Dern and I am a black belt in Brazilian Jiu-Jitsu. I am 20 years old and have been doing jiu-jitsu for 17 years! I am 6x World Champion and 5x No Gi World Champion. When and how did you first come … Fortsätt läsa Pre-ADCC interview: Mackenzie Dern