Wired
2ch find out there are 8 IBM persons joined MS at 2010 or 2012
And 4 of them are about A2
http://www.linkedin.com/pub/adam-muff/7/474/90b
http://www.linkedin.com/pub/matthew-tubbs/9/2b2/815
http://www.linkedin.com/pub/eric-mejdrich/1b/108/214
http://www.linkedin.com/profile/view?id=5337399&authType=name&authToken=kDGg&goback=%2Enppvan_%2Frobshearer&trk=prof-pub-cc-name
http://www.linkedin.com/pub/gene-leung/6/183/2ab
http://www.linkedin.com/pub/steve-faas/20/101/749
http://www.linkedin.com/pub/ronald-freking/5/91/542
http://www.linkedin.com/pub/steven-wheeler/a/7b2/997
And according to 2ch
Eric Mejdrich,Rob Shearer,Matthew R. Tubbs these 3 A2 guy also have patents about ray tracing
http://anago.2ch.net/test/read.cgi/ghard/1360665976/818