Over the years, I've had numerous job titles. I won't go into the details, but most large corporations have a whole range of them, often with subtle little nuances that are not apparent to outsiders but mean a whole lot to insiders as to where one stands on the corporate totem pole.
When I first joined Aspen Research, I was told that I could put whatever I wanted on my business card for a job title as we were just too small to care. So I went big: "Principal Polymer Scientist" or some such nonsense. But what I realized in handing the cards out to (potential) clients, was that they were not interested in the "Principal" but in the "Polymer Scientist" aspect.
So when it was time for a new box of cards, I took a chance and went to the opposite extreme: "Polymer Scientist". Nothing more. No "Advanced", "Senior", "Specialist", "Fellow" or anything else.
I realize that the type of person I am generally handing this out to is different than in the past. This card is going to potential clients, whereas in my previous employments, I was usually handing it out to suppliers. I still keep wondering if there is something better to put as a title, but regardless, this has taught me to think about what I put on my cards and not just go for the most impressive title I can lay claim to. What I put there says something about me and it just may not be what I think it is.