Was just watching the PBS-NOVA special on all this--- and was surprised to see NASA long-duration confinement psychologist, Al Holland, as one of the consultants sent to Chile by the US.
I didn't recognise him at first- he got old!
(this is why I refrain from looking in mirrors)
I worked with Al on the "LC-30" underwater mission about 21 years ago. Good guy- not your 'typical psych,' since he understands the systems & hardware just as well as the mental aspects. Quick google on him finds he was vital to the Shuttle/Mir missions- his NASA Oral History interview is an interesting read.