Michael Spivak is a mathematician specializing in differential geometry an expositor of mathematics, and the founder of Publish-or-Perish Press. He is the author of the monumental six-volume Comprehensive Introduction to Differential Geometry.

His book Calculus on Manifolds is widely admired. His unexcitingly and perhaps even misleadingly titled Calculus is not a mere calculus textbook - although it introduces calculus from first principles, it may be unsuitable for persons wishing to learn to apply calculus to scientific and engineering problems; it is primarily addressed to those who are attracted by the beauty of mathematics.