The son of Jared Ingersoll, Sr., a British colonial official and later prominent Loyalist, Ingersoll was born at New Haven, CT, in 1749. He received an excellent education and graduated from Yale in 1766. He then oversaw the financial affairs of his father, who had relocated from New Haven to Philadelphia. Later, the youth joined him, took up the study of law, and won admittance to the Pennsylvania bar.