Cor Blok was born in The Hague in 1934, and attended the Academy of Fine Arts. After graduating in 1956, he worked at the Gemeentemuseum until 1965, where, among other roles, he compiled a catalogue of the museum's large collection of works by Piet Mondrian. During this time he also painted about 140 pictures inspired by The Lord of the Rings, a selection of which was exhibited at The Hague. When a sample of his paintings was sent to JRR Tolkien this led to a correspondence and eventual meeting with the author, who bought two paintings and was presented with a third. Cor Blok lives in Amsterdam, where he is currently at work on a graphic novel.