Yes - I have read some of his work. I found it interesting but an old school way of thinking. This make sense given his age (86?) and the thinking at the time he received his professional training. Generally speaking his talks about the mind-body connection and the known phenomena of somatization particularly as it pertains to back, neck and limb pain. It is along stretch from muscular pain to IBS. The big problem with his research is that is difficult to use clinical trials with psychosomatic illnesses so there is no way to prove or disprove his idea
Psychological stress may trigger HPA dysfunction in those predisposed to it but it is unlikely to be the cause. Also, there is no doubt psychological stress contributes to IBS but there is little if any evidence that it is the cause.
-------------------- STABLE: ♂, IBS-D 50+ years - Science of IBS