https://noetic.org/about/origins/
Rupert Sheldrake is certainly not mainstream, but he has earned quite a few academic qualifications:
https://www.sheldrake.org/about-rupert-sheldrake/biography
However, any organization that dares to mention parapsychology as worthy of study puts a target on its back. The people who imitate Randi will automatically label it as too far outside the mainstream to be taken seriously.
Parapsychology is not my field of academic credentials, so I will not be taking up the cudgels to defend it -- or Mitch Horowitz-- here. However, skepticism and logic are supposed to be within my bailiwick, so I ought to take up the cudgels against those who present illogic as logic and those who decry logic as illogic. Mitch Horowitz is not exactly a legendary logician, but Randi was a positively harmful influence on logic, so I feel justified in pointing out that Randi was a force for irrationality.