According to Wikipedia Massad Ayoob is an internationally known firearms and self-defense instructor. He has taught police techniques and civilian self-defense to both law enforcement officers and private citizens since 1974.
He was the director of the Lethal Force Institute (LFI) in Concord, New Hampshire from 1981 to 2009. Ayoob now directs the Massad Ayoob Group (MAG).
More than that bio Mr. Ayoob writes some of the best firearm books on the subject of the legal aftermath of a self defense shooting. I widely quote his work in my classes, and recommend his books courses and videos to my students.
I own his stressfire books, and am happy to share this clip of him explaining the stressfire reload for revolvers.
What I like about the stressfire system is that it explains current training methods and shooting techniques, dissects them and then shows his techniques with explanations of why they solve current problems. It advances current techniques rather than supplants them.
An example of this, while I teach the FBI method of revolver reloading, the revolver can get hot after firing numerous rounds and that is uncomfortable. In the stressfire reload for revolvers the way you hold the gun prevents burns.