Michael J Fox of Back to the Future fame has Parkinson's Diseasehttp://www.richimag.co.uk/parkinsons/
Dr James Parkinson was better known in his time for his work on fossils than for his essay on "the shaking palsy".
But it was this that would make his name famous around the globe two centuries after he was born.
His father was a GP and he took over his practice.
His political beliefs were fairly revolutionary.
Its symptoms include shaking, slowness of movement and muscle stiffness.
They found that the lack of a chemical messenger called dopamine was responsible.
Currently, the condition is treated with drugs which mimic the action of the chemical messengers.
This week has been named Parkinson's Awareness Week by the Parkinson's Disease Society