Nikita Tarakanov is a independent information security researcher who likes writing exploits especially for Windows NT Kernel. He won PHDays Hack2Own contest in 2011 and 2012. He also tried to hack Google Chrome during Pwnium 2 but failed.
Some of his 0-day exploits can be found here: http://www.exploit-db.com/author/?a=2978
He has published a few papers about kernel mode drivers and their exploitation.
http://www.blackhat.com/eu-13/speakers/Nikita-Tarakanov.html
http://2012.zeronights.org/speakers
http://www.exploit-db.com/author/?a=2978