Brian Connolly, MPA
I think using the initials after the name denotes a certain level of professionalism. There are people, and I received an email from one, who do not value the MPA as much as they value an MBA. Regardless, it is an earned terminal degree and should be used. Go to my LinkedIn question on the same topioc and see the answers! There is alot of support out there for using the initials.