in the first minutes of this video Stephen Blackburn mentioned David Tarditi and 'Midori', saying they are doing interesting work on garbage collection front, and he mentioned Midori once again at about 7:35

http://research.microsoft.com/apps/video/default.aspx?id=151358

David Tarditi was mentioned by Mary-Jo Foley as a member of Midori team:

http://www.zdnet.com/blog/microsoft/microsofts-midori-whos-on-the-all-star-roster/4149

He is working on Bartok compiler

http://www.linkedin.com/pub/david-tarditi/1/8a7/717