He shares the prize with other internet pioneers Robert Kahn, Vinton Cerf, Louis Pouzin and Marc Andreessen.

BBC: Berners-Lee wins engineering prize for world wide web

"Assumption piled on assumption piled on assumption, " says Robert Kahn, Stewart's valuation wizard.

FORBES: Growth at a Price

Dr Robert Kahn won the Lifetime Achievement award for work he did in the mid 1970s developing the protocols that underlie the workings of the internet.

BBC: The BBC has scooped three prizes at the annual Webby Awards.