Chances are most people reading this will say "who".
Well he's someone who knows rather a lot about cycling, cycle infrastructure and what might get more 'normal' people cycling.
If this these things interest you, read http://hembrow.eu/blog
An extract from the last(?) post.
"
I've attempted to build something which was a useful resource for cycling campaigners across the English speaking world and everywhere else that should be using the Netherlands as a reference for how to implement quality cycling infrastructure, but nearly always is not. There was a dearth of accurate information, and abundance of misinformation, about Dutch cycling policy in the English language. I sought to improve this situation.
...
While some people from commercial organisations took the time to tell me that my work was "valuable", never did this "value" extend to offers of payment when they asked me to work for them. Some people seem to take a delight in pointing out that they have "no budget" to pay others while they themselves draw a regular salary.
"
If that sounds at all 'bitter' I think it's justified.
It's sometimes a fine line between being a 'campaigner' and actually being enough of an expert that people attempt to put into practice some of your ideas without understanding enough about 'what works in the Netherlands' - and that it might not work if directly copied into the UK!