I was wondering how many use titles for instructors in the various schools on this site. I'll tell you a funny story. I never used titles, it was always "Joe" and actually I still use "Joe". However, when using my name on martial arts related subjects, I always use the title of shihan I received from Professor Cerio in 1992, truthfully out of respect to the late Professor, not to mention I was proud to earn it from him, but there's more to the story than that.
I was teaching a seminar along with the Professor held at one of his schools in R.I. It had to do with police self defense (defensive tactics) in regards to teaching martial arts instructors how to teach police officers for the U.S. Police Defensive Tactics Association. Everything was going great (so I thought) until Professor Cerio took me aside and told me nothing aggravated him more than when one of my students would refer to me as "Joe" instead of Shihan Shuras (as you can tell, Professor was strict on the protocol of using titles). I said to him respectfully, "Professor, you have to understand, I've been a cop since 1977, I've been called a lot of things during that time, I'm perfectly happy when I hear just 'Joe'!" With that he gave me a smile and a wack off the head and we went on with the seminar.
I'm still more comfortable using my first name when teaching but out of respect to the Professor and the great appreciation & pride for him bestowing the title of shihan on me I use it in all written exchanges. I also believe titles should always be used in signing certifications.
I'm curious to hear from others on their personal preferences on this subject. Ofcourse, when visiting other schools or events, I always observe the proper protocol that is expected.