Believe it or not, referee John Higgins has somehow been chosen to work the Final Four.
Other refs you might recognize on the Final Four list are Doug Sirmons and Ted Valentine.
According to Jeff Goodman:
Ref assignments for the Final 4, source told ESPN: Mike Eades, Doug Sirmons, John Higgins, Ron Groover, Ted Valentine, Jeff Anderson, Michael Stephens, Tony Padilla, Verne Harris. Terry Ogelsby is the standby. Eades, Harris and Stevens in the championship game.