hey, i'm an engineer so i can help you out a little bit here.
to be considered an EIT (engineer in training) you have to have graduated with a 4-year degree from an accredited university & passed an 8-hour fundamentals of engineering exam
to be an PE (professional engineer) you have to have been an EIT for 4 years, worked under a PE, and taken another 8 hour exam.
these are the bare bones requirements, each state is a little bit different.
my guess is that he is a PE, but it might be embarrassing if you address him as that, and he is not. so i guess my "engineering" recommendation, is to leave the title out. i don't think it would offend him .