That's what got me started writing books. Halmos was off and running. After a short stint at Syracuse University, he spent the late 1940's and the 1950's as a junior member of the University of Chicago's powerhouse mathematics department. He has won several awards for expository writing, and in 1993, he received a Distinguished Teacher award from the Mathematical Association of America . I am proud to be a teacher.
Teaching is an ephemeral subject.
It is like playing the violin. The piece is over, and it's gone. Writing is permanent. It is generally regarded as difficult to explain mathematics to nonspecialists. I give talks on problems, not in detail, but at a level that has a chance of reaching them.