Neel used to run vulnerability research for ISS, the second vulnerability lab ever started (;]) and the largest, and is universally acknowledged as one of the best in the field. Tavis Ormandy you all know from the recent publicity, but I've been paying attention to him ever since he wrote a paper on busting hypervisors by fuzzing their simulated device interfaces. Julien wrote metasm and a few hunred other things for Metasploit. Michal is lcamtuf, author of p0f (one of the most famous Unix network security tools of all time) and a vuln researcher since the '90s.
It is remarkable that Google employs these people, and just as remarkable that these are the people Google chooses as spokespeople for their software security policies. An extremely clueful move on G's part.
It's also remarkable that it's taken until 2010 for it to hit the mainstream that the words "Responsible Disclosure" are Karl-Rovian in prejudicing listeners against researchers and in favor of vendors.