The psychologist in question is of course who is also an expert in the field of forex trading (trading psychology) and has been able to achieve consistent profit because teachers from any stream, whether purely technical, fundamentalist, psychologist and so on, if not successful in forex are just lying. Here the question is a psychologist who is truly an expert in trading psychology and has been successful in forex too.
If psychologists in general, I don't think we will be successful, either, because in running forex trading it is not only psychology that plays a role but there are so many aspects, so general psychology is as good as anything, it is not necessarily successful in forex. Still need other knowledge that is quite complex in achieving success in forex.
There is psychology, there is management, there is mathematics, there is health, there is discipline, there are statistics and so on, very complex trading discipline is a psychologist, in my opinion, only part of the knowledge that we must master, besides good psychology is formed from personal, not derivative , not gifts, can't be bought and so on, other people can only direct.