John Woolman lived in Mount Holly, New Jersey. He became an abolitionist when he was in his early twenties. He refused to write the part of a customer's will which would have transferred the ownership of the customer's slave to another person. He convinced the owner to set the slave free instead.
In 1753 John Woolman published his essay Some Considerations on the Keeping of Negroes in which he says:
"To consider mankind otherwise than brethren, to think favours are peculiar to one nation, and to exclude others, plainly supposes a darkness in the understanding."
Woolman shared his abolitionist views as a traveling Quaker in a deeply racist Northern America.