Another interesting one, not related to Bschool
Rajat Gupta -former MD of McKinsey ---> He was rejected twice
by McKinsey and later got in with his prof's help
An HBS professor intervened on his behalf and, vouching for his enthusiasm and intelligence, helped Gupta obtain an associate position at the firm's New York City office.
He joined McKinsey & Company in 1973 and went on to become the firm's first managing director born outside of the US, completing three full terms at the coveted position. Gupta became the head of the Scandinavian offices in 1981 and the head of the Chicago office in 1990. In 1994, he was elected managing director. Gupta is widely regarded as one of the first Indians to successfully break through the glass ceiling in corporate America. One of the Joke at McKinsey - We didn't recognize our Boss!http://www.nationmaster.com/encyclopedia/Rajat-Gupta