Unable to possess any of this information for himself, Stevens, upon return, began his own research and collection effort, eventually amassing the largest private collection of UFO photographs in the world. He began to publish reports on the events, and wrote many illustrated articles for many UFO publications. Disenchanted with the dearth of detail on contact events reported in books and journals of the time, he began preparing detailed reports of his own investigations. He has published more than 22 books. He continues his investigations at his own expense, still seeking the elusive answers to the many questions raised by this phenomenon. Wendelle has been a Director of the International UFO Congress since its inception.