Hawking poses with his wife, Elaine Mason, after they were married at Shire Hall in Cambridge on Sept. 15, 1995. Hawking, then 53, had a crippling motor neuron disease. Mason was his former nurse, and her ex-husband, David, was the computer engineer who adapted the scientist’s voice synthesizer so it would fit onto his wheelchair.

Hawking poses with his wife, Elaine Mason, after they were married at Shire Hall in Cambridge on Sept. 15, 1995. Hawking, then 53, had a crippling motor neuron disease. Mason was his former nurse, and her ex-husband, David, was the computer engineer who adapted the scientist's voice synthesizer so it would fit onto his wheelchair.

Hawking poses with his wife, Elaine Mason, after they were married at Shire Hall in Cambridge on Sept. 15, 1995. Hawking, then 53, had a crippling motor neuron disease. Mason was his former nurse, and her ex-husband, David, was the computer engineer who adapted the scientist’s voice synthesizer so it would fit onto his wheelchair.

Hawking poses with his new wife Elaine Mason after they were married at Shire Hall in Cambridge on Sept. 15, 1995. Hawking, then 53, suffered from a crippling motor neuron disease. Mason was his former nurse, and her ex-husband David was the computer engineer who adapted the scientist’s voice synthesizer so it would fit onto his wheelchair.