Last year, I had the pleasure of attending a seminar by the legendary Leo "Leozinho" Vieira--a multi-time world and ADCC champion and the co-founder of Checkmat (one of the top teams in jiu jitsu). Fortunately, he will be returning to the area next month (August) to offer another seminar in the gi. If you live in the area, you should definitely reserve a spot. While he covered some good techniques the last time I saw him, his focus on the principles and concepts of passing were especially useful. The seminar will be hosted at the local Checkmat affiliate here in Charleston over in Mt. Pleasant.
Bill is the owner and head instructor at Checkmat Charleston.