Michael Grant is a well-known author who has co-authored several successful series with Katherine Applegate. These include Ocean City, Making Out, Summer, Animorphs, Everworld, Remnants, and Eve and Adam. He has also been involved in several pseudonymous projects such as Christy (the TV spin-off books), Sweet Valley Twins, Girl Talk, and various Disney spin-offs. Additionally, he is the pseudonymous author of Barf-O-Rama. As a solo author, he has written the Gone series, BZRK, The Magnificent 12, Messenger of Fear, Front Lines, Monster, and A Sudden Death in Cyprus.

Michael Grant has also worked under the pseudonyms Michael Robinson and Michael Reynolds, contributing to restaurant reviews, newspaper features, and political media production (Team Blue).