Many simply left the profession and did something else.
Last year a record 50,000 left the profession.
Others, like Mr. Silverman, left the profession after short stays.
(Ms. Hardwick has since left the profession to go into politics).
After her death, many of her colleagues left the profession, fearing for their own safety.
The government's own statistics show that last year nearly 50,000 teachers left the profession.
Within two years of qualifying as a nurse I had left the profession, I thought permanently.
Yet, here I am, a 30-year-old outstanding teacher, and I've just left the profession.
The recruitment drive aims to attract social workers who have left the profession and people looking for a career change, as well as people making initial career choices.
"If the practice of law was as interesting as the world I write about, I wouldn't have left the profession," said Mr. Kelley, who practiced only briefly.
Thousands more have left the profession or are simply dying, especially in southern Africa, where rates of H.I.V. infection are highest.
