Kimeu began to work in
paleoanthropology as a laborer for
Louis Leakey and
Mary Leakey in the 1950s. During his job interview, Louis Leakey spoke with him in fluent
Kikuyu, a similar language to Kikamba, which encouraged Kimeu to work with the team. In 1963, he joined the expeditions led by
Richard Leakey, the son of Mary and Louis who followed in their footsteps as a paleoanthropologist. Kimeu accompanied him to the
Omo River and Lake Rudolf (now
Lake Turkana) in 1967. He quickly became Richard Leakey's right-hand man, assuming control of field operations in Leakey's absence. He was known by colleagues as, Mr. Kamoya. In 1977, he became the
National Museums of Kenya's curator for all
prehistoric sites in Kenya. Kimeu was described as “a legend...responsible for some of the most significant fossil finds that shaped our understanding of our evolutionary past” by Carol Ward, a professor of anatomy at the University of Missouri. == Personal life ==