Larry Barham, PhD University of Pennsylvania, has been researching human evolution in sub-Saharan Africa since 1982. His doctoral research was in Swaziland (Eswatini); since 1993 he has focused on Zambia. His approach is cross-disciplinary, whilst retaining a primary interest in the cultural and evolutionary impact of early technological transitions. Recent excavations led to the discovery of the oldest wooden structure, dated to ~500,000 years ago at Kalambo Falls, Zambia.