Read all about him on Wikipedia or - pop over to his web site
I had two of his books a long time ago. Long gone / misplaced / lost. But, if you are interested in the music of the 60s and 70s, the books and trees inside contain a veritable cornucopia of visual information relating to the music of the day.
I have often thought that it would be interesting to see something similar done for the software industry - again starting in those heady days and how companies were gobbled up, grew, where the founders went to etc … I think the results would be fascinating.