Henry completed preparatory studies and then studied law. He was admitted to the bar in 1803 and commenced practice in Chillicothe, Ohio. For a time, he was in partnership with his brother, Platt Brush.
Henry finished preparatory work and then studied law. He became eligible for the bar in 1803 and started practicing in Chillicothe, Ohio. For some time, he collaborated with his brother, Platt Brush.