He did start out doing respectable work in biochemistry and physiology; but has ended up promoting all sorts of ideas that claim to be scientific but are not supported by any real evidence, and go against most other findings.

I'm not saying that everyone needs to be a scientist, or that science is the only way of looking at the world. If someone wants to study the world through a field other than science - philosophy; literature; art; history; for that matter, religion - then that is great. But I have little respect for people who produce pseudoscience and claim that it's science, and who then accuse others who point out the lack of foundation for their theories of not being sufficiently 'open-minded'.