Jos Croin decided to become a painter when he was 11-years-old after visiting a van Gogh exhibition. At 16 he won a gold medal in Vlissingen at an exhibition of Zeeland painters. Croin studied at the State Academy of Fine Arts in Den Haag, beginning when he was 18, later studying at the State Academy of Fine Arts in Amsterdam for two years. Croin moved around a bit, living in Laren in 1918 and Den Haag in 1918-20, and moving to Paris in 1920, where he studied under the Fauvist Othon Friesz. He later studied in France and Spain and worked on both the Brittany and Normandy coasts. Croin painted portraits, cityscapes, landscapes, figures, and still lifes in oil, but he also produced drawings and graphic works.