He was a tutor at Princeton from 1767 to 1769, and a pastor in New Haven, Connecticut from 1769 to 1795, where he was dismissed from this position due to doctrinal conflicts in the church.

[2] Unlike his father, who was a slave-owner, Jonathan Edwards the younger supported abolition of the slave trade and of slavery.

His anti-slavery viewpoint was first evidenced in 1773, when he wrote a series of articles entitled “Some Observations upon the Slavery of Negroes” in the Connecticut Journal and the New-Haven Post-Boy (Gamertsfelder, p. 137).

[4] In 1755, Edwards's father sent him to stay in the Iroquois settlement of Onohoquaga as part of his training for future missionary work.

In Observations on the Language of the Muhhekaneew Indians..., he chronicled basic vocabulary and grammar rules and recorded the marked differences between Mohican and English.

He argued against the misconception that Native Americans had no distinct parts of speech in their language: Among some of the grammar rules he noted was that Mohican "[has] no diversity of gender, either in nouns or pronouns".