American business magnate and founder of Microsoft, Bill Gates with Stephen Hawking.
Barack Obama speaks with scientist Stephen Hawking during an award ceremony. (Image: AFP)
Britain's Queen Elizabeth met Stephen Hawking at Leonard Cheshire Disability charity in 2014. (Image: Reuters)
Pope Francis meets English theoretical physicist and cosmologist Stephen Hawking.(Image: AFP)
Stephen Hawking with former South African president Nelson Mandela during his visit to South Africa. (Image: Reuters)
Barack Obama honouring scientist Stephen Hawking the nation's highest civilian honour in 2009. (Image: Reuters)