Johanna Petronella Catharina Antoinetta “Jo” Koster (1869–1944) was a versatile Dutch artist who did paintings, watercolors, drawings, etchings and lithographs. She also distinguished herself for her work in embroidery and wood carving. At an early age, she apprenticed in Dordrecht and subsequently studied at the State Normal School in Amsterdam, where she obtained a diploma in Drawing. She was then appointed as a teacher at the Art Academy in Rotterdam. Koster traveled abroad, visiting the studio of Filippo Colarossi while in Paris and lived three years in Brussels as a student of Ernest Blanc-Garin, where she became proficient at pastels. In 1902, Koster returned to the Netherlands and founded a drawing and painting school. She continued to hone her skills the rest of her life.