Roger Hobden
Contributor
Well it's on their website.
GUE Instructor resumé | Global Underwater Explorers
So it's on the web page of JJ's résumé. Very good. But not every potential buyer of any and all forms of GUE educational material will necessarily scrutinize very closely that page.
I believe it should also be mentioned on every web page where GUE recommends equipment, whether the course pages or the books pages.
Come to think of it, I believe that all that would be necessary would be a friendly reminder that "JJ, unsatisfied with the available gear at the time, created Halcyon because it filled a perceived need, but, OTOH, purchase of Halcyon gear is not required to attend the GUE courses", or words to that effect.
No more, no less. No muss, no fuss.