Hi Alisa
Before I got engaged, I was looking for a Tier 2 sponsor myself. It's already been said, but yes, it is very difficult! I found Recruiters did not want to help me at all with needing a sponsorship.
As a university professor though, it may be easier as most major universities are licensed to sponsor and welcome applications from anybody, as long as the position pays over a certain amount (the normal is £20,800 but I have found some universities aren't willing to sponsor you unless you're applying at a certain pay grade. As a professor though this shouldn't be too much of an issue!)
I would look into Universities really and if you are unsure, look at the Tier 2 sponsorship list (A very large PDF page that can be found on google!). Even if you don't go the university route, I think it is easier to get a consideration if the company is already licensed to sponsor.
I hope this helps a bit! Just going off my own experiences