Clarkson was the author of a pamphlet entitled A Summary View of the Slave Trade and of the Probable Consequences of Its Abolition, published in 1787.
Clarkson had a high regard for Falconbridge who on more than one occasion acted as his personal armed bodyguard whilst he gathered evidence against the slave trade.
After meeting Clarkson, Falconbridge published in 1788 An Account of the Slave Trade on the Coast of Africa,[4] 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[5] In 1790 Alexander gave verbal evidence before a House of Commons Committee.
The couple quarrelled; Falconbridge began to drink excessively, due to marital problems and ailing health and, it would seem, disenchantment with the Sierra Leone Company.