MtBerg

Hello all, I am in the process of applying to several history PhD programs, but there is one specific application that I am a bit confused about. There is a professor doing research that is as close to my own interests as I have found, yet this professor is an associate professor at the university's relevant regional studies program, and merely an adjunct associate professor of history (although this professor's focus is 100% history). I know that adjunct professors generally cannot be advisers, but since this person is a a full time professor in a related department, is it likely that they could be my adviser for a history PhD? I have already reached out but have not yet received a response. I am planning on applying either way, but I am starting to get a bit anxious about it.