FYI, Jeff Dean is the inventor of most of Google's distributed computing infrastructure including MapReduce. Definitely up there with the likes of John Carmack and Fabrice Bellard as one of the great software engineers of all time.
Maybe some people do, personally I'm more familiar with the works of Fabrice Bellard, and that's probably fair enough since I expect I have more pieces of software derived from Bellard projects installed on my machine than I do software derived from Jeff Dean projects (not to criticise Jeff Dean, who I'm sure is very inspirational).
I just wanted to do a +1 here, but as it is not very HN-worthy, I'll provide a little bit more of work, and just say that a search in HNSearch for "Fabrice Bellard" produced 3 pages of results for tha last year, whereas "Jeff Dean" only produced 2.
Personally, I feel I've been more exposed to Fabrice Bellard's work, which might be not true, but I first learned of Jeff Dean's existence yesterday.