Henrion seems to be largely overlooked these days, but he was the man who was instrumental in introducing modern corporate identity (or branding, as most people call it these days) to the UK. During the 1960s and early '70s he, almost single-handedly, took design from looking like this:-
to looking like this (and this was ground-breaking stuff at the time):-
Henrion was a contradictory man and, from bitter experience, not the easiest person to work for. At the time the National Theatre logo was designed his studio was trading as HDA International, and comprised Henrion and three 'design assistants' - Peter Cockburn, Ian Dennis and myself. The studio had been asked by the National Theatre to pitch for their new identity against Pentagram and one other studio (who's name I can't recall).
Ian was something of a 'golden boy' in Henrion's eyes - quite rightly, because he was a good designer (though the Simon Amstell hairstyle might also have helped). Peter and I, on the other hand, preferred to style ouselves as the grumpy young men of Pond Street.
Ian had been assigned to work with Henrion on the presentation (Henrion's working method was to 'conceive' the idea and then get one of his 'design assistants' to carry out the delivery). Somehow (and I guess it was the 'golden boy' status) Ian managed to persuade Henrion that he should also be allowed to pitch an idea. And so Ian designed this:-
I recall Ian coming back from the presentation to the National Theatre board and telling us how brilliant Pentagram's presentation and solution was (I bet it had been done by that Alan Fletcher chap) and that it was bound to win. But, of course, it didn't - and neither did Henrion's.
Which left a very awkward situation in the studio - because Henrion simply wasn't used to being 'slighted'. So the attribution for the design started out as 'designed by FHK Henrion and Ian Dennis', but was replaced after a few months with 'designed by FHK Henrion and executed by Ian Dennis', and eventually became 'designed by FHK Henrion'.
I don't know what happened to Ian (and he probably doesn't know what happened to me). Ian, if you're out there, this sets the record straight.