Nimoy published many books of poetry and photography over his life, but his most famous works were a 1975 biography titled I Am Not Spock, and a 1995 follow-up, I Am Spock. He later said he regretted the "firestorm" of controversy the first book caused. The cheeky title was intended as a jumping-off point for a discussion of the differences and similarities between an actor and the character he plays.