This depends on the field and how successful the grad student was. In lots of fields, including CS and different kinds of engineering, this is somewhat common.

This depends on the field and how successful the grad student was. In lots of fields, including CS and different kinds of engineering, this is somewhat common. Some will defer the appointment a year and do a postdoc anyway because that provides time to prepare research problems before the tenure clock starts to tick. In math and the sciences, you hear a lot more stories of multiple postdocs being required before you can be considered for a professorship. I don't have first hand experience in those domains, however.