Whilst this veers off-topic, I don't use the formal title, even though I have earned the right to do so. It's actually not just a matter if humility. I find tha

Whilst this veers off-topic, I don't use the formal title, even though I have earned the right to do so. It's actually not just a matter if humility. I find that, when introduced with the title, people ask me for medical advice. I am a mathematician, not a physician.