In this video Gebisa Ejeta introduces his work and discusses his most exciting current projects.

Gebisa Ejeta is a world-leading, award-winning plant scientist developing drought-resistant crops for Africa. He has experienced hunger first-hand, during his childhood in Ethiopia, and is now an adviser to President Barack Obama, as well as being a World Food Prize Laureate and Distinguished Professor at Purdue University, USA. He spoke to A C Grayling about addressing the current food crisis in the Horn of Africa and abolishing famine worldwide.

Exchanges at the Frontier with Gebisa Ejeta was recorded at Wellcome Collection on 8 December 2011 and was first broadcast on the World Service on 24 December 2011.