Who is the Mystery Man?

During the end of the film, we got to a scene were we watch and listen to Dr. Conner talk to a mysterious man. Who, in your opinion, is he. I already came up on my decision on who he is but im interested in seeing who do wewe think he is. Don't be shy to anwser, everybody has different opinions.

Oh just to let wewe know, this is not Norman Osborn.