Consider the following:

1. You never actually see Santa, only his "assistants."

2. Santa keeps his job until he decides to retire.

3. Santa doesn't really do the work; he directs a bunch of helpers to do all his work for him, but he's the one who everybody credits with the work.

4. Santa doesn't work anywhere near a 40 hour week.

5. Santa travels a lot.

Yep, Santa is obviously a senior faculty member with tenure