Thomas Lee is a writer, trainer, and consultant living in the UK. A veteran MVP, Thomas today specializes in PowerShell, OCS/Lync, and Windows.
Karl Mitschke is a systems engineer for the state of Montana. His focus is Microsoft Exchange administration, with an emphasis on Windows PowerShell.
Mark E. Schill is the President of the Atlanta PowerShell User group and maintains the powershellgroup.org site. He specializes in Citrix environments and task automation.
Tome Tanasovski is a Windows engineer for a Fortune 100 financial services firm and the leader of the New York City PowerShell User Group. He is a recipient of the Microsoft MVP award for Windows PowerShell.