I have followed the writings and overall interview history of two of my favorite UFO researchers: Richard Dolan and Linda Moulton Howe.
Few ufologists are as impressive as these two.
Both of them share one common thread as far as how they even got into ufology. They can both lay claim to being young researchers who were (separately --never even knew each other, and never met until years later on the UFO talk scene) both researching something totally unrelated to UFO's. But then during the course of research they each had the same experience whereby when the two separate rabbit holes they each went down proved suddenly deeper, and then Wonderland turned out to be full of extraterrestrials.
RICHARD DOLAN'S STORY
His rabbit hole presented itself when he (his masters degree is in Russian Studies) was researching Soviet-US hostilities. During that research, he accidentally discovered disturbing similarities in UFO reports as found in US military documents when compared to Soviet military documents. Specifically, there was a whole massive cache of Soviet documents that got recovered/borrowed/stolen/bartered for by US intelligence after the Soviet Union fell. And Dolan became privy to their contents during the initial time period when those massive hauls of Soviet documents were being translated into English by Russian Studies colleagues of his. He was so stunned to learn of just how many Soviet military documents made reference to UFO's that he decided to see how many US military documents likewise made such reference. And that staggering mountain of American military paperwork and FOIA requests has kept him busy to this day. One of his early findings is that the Soviet documents repeatedly reported the same two behaviors of the craft: 1) these craft defied all known laws of physics, and 2) these craft seemed particularly interested in Soviet nuclear installations. And so when he began to check out US military documents for a comparison, the same two behaviors got repeatedly mentioned in the US documents: 1) the craft defied all known laws of physics, 2) the craft seemed very interested in US nuclear installations. It is also noteworthy that some of the Soviet documents offered speculation that perhaps these were new, secret, and very advanced US craft. But then the US documents offered the identical speculation in reverse, suggesting that perhaps these unknown craft were in fact new, secret, and very advanced Soviet craft. He became convinced that these craft were very real, and yet were neither Soviet nor US.
LINDA MOULTON HOWE'S STORY
Moulton Howe's rabbit hole started not too long after she landed her first job just out of college as a television broadcast reporter. The TV station she worked for was somewhere in the American West. She went to cover a story about a cattle rancher who suffered the loss of several of his cattle to brutal mutilations by an unknown perpetrator. When she interviewed the rancher and the sheriff and the veterinarian who did the autopsy, the details of their stories so stunned her that she knew she was dealing with what she later came to call "high strangeness." These mutilations happened in the middle of the night. The mutilations were "bloodless" which means various organs were taken, but not a drop of blood lay on the ground anywhere around the carcasses, nor even any blood on the carcasses themselves. The carcasses were discovered the next day, usually out in the fields, with zero tracks anywhere around the body: no footprints of humans, no hoof prints of the cattle, no paw prints of predators such as lions or coyotes, no tire tracks --nothing. The extraction of the targeted organs was surgically perfect: eyeballs, lips, testicles, anuses. All the organs were precisely removed with nothing left behind, and yet also with little to no surrounding tissue taken as unintended collateral. And then there was mention of the strange lights in the sky on the same night of the mutilations. She was now hooked. And then she found out about ... the OTHER mutilations. Hundreds of them. All over the USA and even around the world dating back to about 1911 (a case of sheep mutilations in England IIRC). All of them with these eerie details which defy known medical technology. And most of them with tales of strange lights in the sky on the same night as the mutilations. She is now perhaps the world's foremost authority on the subject of cattle mutilations.
Both of these two researchers have spent most of their careers focused upon UFO's. Something is going on. The truth is out there.