Johnson taught many students in his 59 yearlong career as a teacher in Connecticut and New York. His most important pupil was one of the founders of the American Republic: Johnson was the father of Dr. William Samuel Johnson, a Founding Father of the United States, who attended the Stamp Act Congress, the Continental Congress, the United States Federal Constitutional Convention, and was the first U.S. Senator from Connecticut at the 1st United States Congress; he was "the only man who attended all four united congresses" that founded America. He followed his father's footsteps, attending Yale, and becoming president of Columbia College. A lawyer often called to argue in inter-state disputes, and a Colonial Agent to England from 1767 to 1772, William Samuel Johnson is best known as the Chairman of the Committee of Style that wrote the U.S. Constitution: edits to a draft version are in his hand in the Library of Congress.