He was the ex rolling stone magazine journalist that started BIKE Magazine, he almost singlehandedly invented the modern motorcycle rag. His idea was to make it a fun read and not just a technical journal. His method was to live the lifestyle that the bike manufacturers were using as their sales immage. This was in the 70's so you can probably imagine what that might have involved. He sold the mag to emap (east midiland allied press) who used it a the start of the biggest bike publishing house in the uk. He also started 'Which Bike' and 'Motorcycl;e international'. He reputedly did some time in the US for Cocain smuggling, but that may just have been an oversized personal stash (don't know the details) and is now back in the UK doing freelance bits and pieces with a regular colomn in one of the classic mags.
As a teenager he was my biggest hero (and in some ways still is).
And I very much doubt it was him, just one of the other 'Mark Williams's out there.