Where did Tolkien become a professor and started teaching?

1)  Tolkien wrote The Hobbit to entertain his children.

2) It took about 17 years.

3) Tolkien became a professor and started teaching at the University of Oxford.

4) J.R.R. Tolkien was born in Bloemfontein, South Africa.

5)  The name of the writing group was Inklings.

6) Tolkien studied  English Literature.