Hmmm.. I've got 13 peer reviewed Neuroscience publications under my name, 1 book chapter in press, 2 articles in submission (one to Nature Neuroscience and one to Neuron), and several published and unpublished custom-written toolboxes for analyzing brain imaging data. I guess my Ph.D from UC Berkeley also ads to my geek-credit.
That said, Critchon was trained as a clinician through and through, not scientist. From what I can find, most of his non-fiction work in peer-reviewed journals is a review or meta-analysis. So he might have dabbled in programming and such (to give him some geek cred), I think he knew only the gist of the science he used in his popular works. He was by no means an expert.