Answer
In 1972, Mary Leakey became the director of the Olduvai excavations, taking over from her husband, Louis Leakey. She had been working at Olduvai since 1959 and had made significant discoveries, including the remains of Homo habilis, an early hominin species. As director, she continued to lead the excavations and made further important discoveries, including the remains of Homo erectus and evidence of early human tool use.