 After meeting Clarkson, Falconbridge published in 1788 "An Account of the Slave Trade on the Coast of Africa", an influential book in the abolitionist movement.In this book he talked about the trade from when the ships first acquired captives from the African coast, through their treatment during the Middle Passage, to the time they were sold into hereditary bondage in the West Indies

In 1790 Alexander gave verbal evidence before a House of Commons Committee.Many of them were hostile toward him.