He was controller of BBC 2 at the time when colour television first reached Britain.I think the most positive proof about how much Sir David loves his work is that he choose it over running the whole BBC, a job he was going to be offered at one point.
I love his work on the BBC's Natural World unit - it was always fascinating and never fails to draw me in when it's on television. He has a true passion for education, science, and broadcasting - no wonder he currently belongs to the Order of Merit.

To see people who don't understand his work badmouth him like that is simply sad.