Answer:
Stephen Hawking.
According to wikipedia, Stephen William Hawking was a British theoretical physicist, astrophysicist, cosmologist, and science popularizer.
"Stephen Hawking was one of the greatest theoretical physicists of the modern age. Best known for his appearances in popular media and his lifelong battle against debilitating illness, his true impact on posterity comes from his brilliant five-decade career in science." (livescience.com)
