As a candidate for CISSP certification, I had the pleasure of having Leo provide the "meat" of a 2-wk CISSP bootcamp. Leo very quickly demonstrated his mastery of not only the subject matter, but also of the art of instruction. It's one thing to be able to teach the material, but when you're in front of a room of military professionals with the gamut of domain experience, you're going to field some tough questions; Leo had no problem with those and ensured that responses were given in such a manner as to assure understanding across the class, regardless of experience. While I felt I had firm foundational footing for the material, the text can still be pretty daunting. Any items I wasn't sure about were quickly cleared up for me. I certainly attribute a large part of passing the CISSP on the first try to Leo's instruction. When in a position to contract training resources in the future, I will certainly give Leo a call.