Marcus Vinicius has spent his entire life becoming a Master level instructor in all senses of the word. He outlines how he feels instructors need to take their job very serious and study all aspects of the human experience to be able to help people. Marcus is known for being a legendary coach and also instructing several Hollywood stars, but he explains how he cuts them no slack and expects only the best.
A lot of great content on his structure of running a program and what he feels matters in martial arts.