L. Ron Hubbard is known primarily as a writer and as the founder of the Scientology religion, but he was also a very accomplished photographer. In the late 70's and early 80's, realizing that the level of literacy of the society had seriously declined, L. Ron Hubbard saw that to ensure that he could impart the technology he developed to anyone willing to learn to help others he would have to develope a visual means of transmitting certain information.
Training films have been with us for a long time, but the kind of training films Mr. Hubbard developed are quite different. He also wrote scripts and treatments for a number of Scientology introductory films as well, and to get an idea of what they are like I recommend you visit a church of Scientology and ask to see their video displays or watch a film.
Completely aside from Scientology introductory and training films, Mr. Hubbard also spent some time in Hollywood as a script writer and the imdb data base of L. Ron Hubbard's filmography includes these contributions as well.