Greg Simkins was born in Torrance, California, slightly south of Los Angeles. His artistic ambitions bloomed at age three with drawings inspired by cartoons and books. Some of these works, such as The Chronicles of Narnia by C.S. Lewis, The Phantom Tollbooth by Norton Juster, and Watership Down by Richard Adams, still find reference in his art. He grew up with a variety of animals, including a number of rabbits, which often appear in his paintings.