Absolutely one of my favorite drawing instructors, I have taken courses with Tony O’Regan at Emily Carr. Below are a few videos of his on perspective. If you go to his website, http://toregan.com/ you will find many.
1, 2 & 3-point perspective
Click on this links for video:
1, 2 & 3 point overview:http://toregan.com/ecuad-persp-day-3-review-1-2-3-point-vid-1-of-8-mar-6-2016/