Here's a brief description. From:

http://www.famousscientists.org/pierre-simon-laplace/

"Pierre-Simon Laplace was a prominent French mathematical physicist and astronomer of the 19th century, who made crucial contributions in the arena of planetary motion by applying Sir Isaac Newtonâ€™s theory of gravitation to the entire solar system. His work regarding the theory of probability and statistics is considered pioneering and has influenced a whole new generation of mathematicians."

A more in-depth look at his role as statistician can be found here.

http://statprob.com/encyclopedia/PierreSimonMarquisDeLAPLACE.html

I love this quote:

'Probability is basically good sense, reduced to a calculus."