Find Schema Master in Windows Server 2008 R2

To find out who has the Schema FSMO in Windows 2008 R2:

• On a DC open an elevated CMD prompt
• Navigate to C:\WINDOWS\System32
• Run the following command: regsvr32 schmmgmt.dll
• A window should pop-up confirming if it registered correctly
• Open MMC
• Add the Active Directory Schema snap-in via the File menu
• Right Mouse click on the 'Active Directory Schema' node and click on Operations Master...
• That should bring up a window telling you the Current Schema Master

Simples.