Professor Harms is the author of The Diligent: A Voyage through the Worlds of the Slave Trade, which has won numerous prestigious awards. He has also written two books on the history of equatorial Africa: River of Wealth, River of Sorrow: The Central Zaire Basin in the Era of the Slave and Ivory Trade and Games Against Nature: An Eco-Cultural History of the Nunu of Equatorial Africa. We talk with Professor Harms about his newest research, a book called The Imperialists and the Slave Trader: Conflict, Collaboration, and the Making of Colonialism in Equatorial Africa, 1874-1905.