Just found this about Glenn...
As Glenn is an (former) expert of Area 51 and he is a pioneer of researching Groom Lake I think I should inform you here that he has been recently diagnosed with a very serious illness. You can find more details on his channel:
Bad Dalai Lama
https://www.youtube.com/channel/UC9o0baLgl_O5Zhzn-yDhQNg
Facing cancer, former Area 51 activist Glenn Campbell summarizes his life and his latest book:
https://www.youtube.com/watch?v=iZshxV8VVMY
https://www.youtube.com/watch?v=7fpkXqN0GdQ