Just to be precise, I didn't say J&J were "working" with Chris Hempel - I said that they were "involved." I can't speak publicly about the nature of the involvement, but you can start with this:
and this: "That might have been the end of the story except for Ms. Hempel’s insistence that more was at stake, says Steven A. Silber, a vice president at Johnson & Johnson. After listening to Ms. Hempel and Dr. Hildreth’s presentation, Dr. Silber set up a meeting so Dr. Hildreth can present his data to the head of one of its companies that makes anti-viral medications. Dr. Hildreth says that Ms. Hempel’s involvement got his research "the attention of individuals higher up in the organization than I might have been able to get on my own."" http://addiandcassi.com/the-wall-street-journal-reports-on-fda-approval-of-addi-and-cassis-cyclodextrin-treatment/
My understanding is that J&J has been an interested observer throughout the trials.