Family, friends and colleagues of Stephen Hawking are gathering to pay their respects at his private funeral in Cambridge University's Great St. Mary's Church. Actor Eddie Redmayne, who played Hawking in the 2014 biographical drama, The Theory of Everything, was there as well. Hawking died on 14 March, at the age of 76. The renowned theoretical physicist stunned doctors by living for over 50 years after he was diagnosed with motor neurone disease at 21. Hawking is known for his work with black holes and relativity and his 1988 book "A Brief History of Time" was a worldwide best seller.