The African origin of our species was scientifically established by Louis Leakey and his family, which is represented in this vigorous conversation by his daughter-in-law, paleo-anthropologist Maeve Leakey. Two other distinguished researchers on the evolutionary emergence of the “talking, walking, thinking” relative of the higher apes join us in this 2003 conversation. Jonathan Kingdon is from Oxford University and Robert Martin is from the Field Museum.