What is Mary Leakey famous for?

Mary Leakey is famous for her finds in Olduvai Gorge and Laetoli which included the first skull of a fossil ape in 1959 and the discovery of an 89 foot trail of early human footprints which dated back to 3.6 million years ago. She's also the wife of Louis Leakey, world renowned paleontologist who declared mankind evolved in Africa!