In Timothy Good's book Alien Contact(1) he writes about a curious encounter a specialist named Dr. Díaz had at his office in Guadalajara, Mexico in 1976. The doctor described meeting a patient with extraordinarily white skin, "almost the color of milk," who was a little over 5 ft. tall, and nearly hairless. Díaz said the man's eyes appeared almost violet and his irises were wider than normal.
While appearing to be in his forties or fifties, the man said he was 84, and even more surprisingly he came from another planet that was "beyond the sun." His mission apparently was to inform humanity that it needed a cleaner energy source as it was polluting not only Earth but space itself. "It is possible to get tremendous energy if you know how to dissociate electrons," he said, explaining that his civilization had discovered more subatomic particles than we had.
Díaz, a well respected doctor who had been in practice for 25 years, eventually related his story to a United Nations delegation. "When I spoke with Dr. Díaz by phone in 1980, he struck me as being completely truthful," wrote Good, who was able to confirm that indeed a meeting at the U.N. with Diaz did take place, though nothing was ever done with the information he gave them.