He is best known for his exploration and mapping of the rivers of the Madre de Dios region in Peru and Bolivia.
When Root went to South America in 1869 as American Minister to Chile, Heath accompanied him as secretary of the delegation.
[4] Heath returned to the United States in 1878, following Meiggs’ death and the takeover of the railway by the government of Chile.
[6] Heath mapped the entire 1200 mile length of the Beni, traveling by canoe accompanied by two local guides.
He participated in the 1916 talks of the League to Enforce Peace, and served as Kansas City Counsel for Nicaragua, Guatemala and Bolivia.