Mark Russinovich is a Technical Fellow in the Windows Azure group at Microsoft. He is coauthor of Windows SysInternals Administrator's Reference, co-creator of the Sysinternals tools available from Microsoft TechNet, and coauthor of the Windows Internals book series. Aaron Margosis is a Principal Consultant with Microsoft Public Sector Services. He specializes in application development on Windows platforms, with a focus on security, least privilege, and compatibility in locked-down environments.