I am a teacher and I am proud of it. At Cornell University I have taught primarily undergraduates and indeed almost every year since 1966 have taught first-year general chemistry.
But I spent just two calendar years at Cornell University though it was covering more than three years of work and then went to medical school and did become interested in psychiatry and even helped form a kind of psychiatry club in medical school.
The improvement of understanding is for two ends: first our own increase of knowledge secondly to enable us to deliver that knowledge to others.