Account Manager Plugin

Hello,

I am wondering if you advise me. I am looking for a plugin that will give me the option to select an account manager on a per user basis and then display the account managers contact details in the frontend.

I dabbled with the idea of doing something custom myself, however I realised this would quickly become a nightmare if say an account manager leaves or changes contact details, you would need to manually go through every user updating it unless you had some kind of relational system which would be a nightmare to build!

Any ideas on how to achieve this? Its esentially a way to link a user account to a person and display that persons contact details and maybe photo on the front end.