Stephen Hawking: Physicist and Educator studies the life and career achievements of one of the world's most famous scientists. Diagnosed with ALS (Lou Gehrig's disease) as a young man, Stephen Hawking has established himself as the world's most famous and beloved scientist despite his severe physical challenges. A world-renowned cosmologist, Hawking became famous for his theories on the origins and nature of the universe, which he has presented in several best-selling books. Known for his sense of humor and fun-loving nature, Hawking shows no signs of slowing the pace of his busy teaching and lecturing engagements, which have made him an international success.