Charles Hopkinson was an American landscape water colorist and a portrait painter. During his lifetime he painted almost 800+ portraits and most of his portraits were commissioned. He had many sitters such as Calvin Coolidge, Oliver Wendell Holmes and John Masefield.
Though he was born in Cambridge but later he moved to New York and there he studied with John Henry Twachtman and H. Siddons Mowbray.
He also studied with Edmond Aman-Jean at the Academie Julian in Paris.
He died in October 1962 at Massachusetts.
References: Hopkinson Virtual Library