IBJJF certified black belt instructor
Federation(which is signed by Carlos Gracie Jnr).
The international Brazilian Jiu Jitsu Federation (IBJJF) is the major and most prestigious governing body for Brazilian Jiu Jistu (BJJ) that hosts several of the biggest tournaments in the world, including the World Jiu Jitsu Championship, Nogi World Jiu-Jitsu Championship, Pan Jiu Jitsu Championship and European Open Jiu-Jitsu Championship.
Stuart also received his IBJJF black belt second degree, You can also see his Nidan (second Dan) in Judo certificate as well.
The federation was created by Carlos Gracie Jr, who is the head of one of the largest Brazilian jiu-jitsu associations, Gracie Barra. The IBJJF is directly connected to Confederação Brasileira de Jiu-Jitsu, sharing its rules and regulations.