Rich, not everyone is a consultant. Not everyone has a public facing job where the degree might "matter." Most, in fact, don't. If you're a professional working with other professionals then you're working with other people who also have degrees. Everyone is fully entitled to put any degree they want on their email signature. But the fact that only the ones with doctorates do it is, I'm sorry to say, incredibly tacky. In a room full of engineers what matters is that you're all engineers. If one person in the room insists on displaying their PhD or being called doctor it will be noticed and not in a good way. You have a doctorate? Great! I might have an M.Eng. So what? Your doctorate might not, depending on the field of study, even be relevant to what we do. We know you're qualified that's why you're in the room in the first place. I will admit that, years ago, your title did matter. Today it does not. If you earned a doctorate in the 1990s then there was a good chance you had the most education in the office by a lot. Depending on your field, you might be surrounded by people who never even finished their undergrad and left to work. Today, degrees are everywhere. No one is saying hide your degree or don't be proud. I'm saying that if your company is owned by another company based in any country other than the US (especially) then there is a strong cultural idea of setting yourself apart by working hard not because you walked in with a different degree than the other people. I've recruited employees for a lot of places. The only time I have seen people insist on being called "Doctor" at work is when they are physicians. And I have seen more than a handful of applicants with doctorates get passed over because they did silly things like introduce themselves to their interviewer as "Dr. Smith, but you can call me Chad." In the classroom, the doctorate means you get to sit at the front of the room and people pay to learn at your feet. In the workplace such recognition is a barrier to collegiality. I need to work with Rich, not Dr. Douglas. There are very few workplaces where such formality is tolerated let alone expected. In such a formal setting it would also be proper for you to call me Mr. Neuhaus. And I'm hard pressed to think of an actually successful company where that is the norm.