How to change your identity on Undercover Boss: 1) Change Hair part/ style 2) Wear/ remove glasses 3) Shave/ Grow beard, amirite?

4) Wear a hat

It works because, most of the time, the boss has had no previous interaction with these low level workers. They've maybe seen a couple pictures of him and that's it, so obviously they won't recognize him with slight differences.

It honestly works, though. I've had people not be able to recognize me after I grew a beard. Granted, these people hadn't necessarily seen me too much in the past.

I agree. Change in amount or color of hair will work with people that are not very familiar. Hair is a big deal for visual recognition. :)