academic rank

I have, of late, received a number of emails asking advice on matters somewhere in the territory between ethics, etiquette, and effective communication with members of the tribe of science. While I'm no Ann Landers (as has been noted before), I'll do my best to answer these questions on the blog when I can, largely so my very insightful commentariat can chime in and make the resulting advice better than what I could generate on my own. Today we have a question from a reader struggling with the question of how to address one letter to two doctors. He writes: Hi Dr Free-Ride, I'm not sure if…