I always thought Rupert Sheldrake was a lot less wrong than the impression given by his critics, though he's certainly become an utter crank focusing on dubious "telepathy" experiments and attacking the "orthodoxy" to the point where he's impossible to take seriously now.

His thinking around the 80s and early 90s was onto something I think, even if he largery missed the mark when it came down to the details of his theory.