Professor Lewin got his PhD in Nuclear Physics at the Technical University in Delft, the Netherlands in 1965. He joined the Physics faculty at MIT in 1966 and became a pioneer in the new field of X-ray Astronomy. His 105 online lectures are world renown and watched by about 2 million people yearly. Lewin has received five teaching awards. He is the only MIT Professor featured in "The Best 300 Professors" of The Princeton Review.