Mark Russinovich is a Technical Fellow in the Windows Azure group at Microsoft working on Microsoft’s cloud operating system. He is a widely recognized expert in Windows operating system internals as well as operating system security and design. 

Russinovich is the author of the recently published cyberthriller "Zero Day", co-author of the Microsoft Press "Windows Internals" books, and co-author of the "Sysinternals Administrator’s Reference". 

Russinovich joined Microsoft in 2006 when Microsoft acquired Winternals Software, the company he cofounded in 1996, as well as Sysinternals, where still he authors and publishes dozens of popular Windows administration and diagnostic utilities. He is a featured speaker at major industry conferences, including Microsoft's TechEd, WinHEC, and Professional Developers Conference.