Dr. Matthew Lewis is a sport psychologist, educator, and author based in Phoenix, Arizona. He holds a PsyD in Applied Sport Psychology from the University of Arizona and a Master's in Educational Leadership and Policy Studies from Arizona State University, and his work for two decades has lived at the intersection of human performance, character formation, and the questions philosophers and theologians have been asking for two thousand years.

He is the founder of Lewis Publishing House, the independent literary imprint that publishes the Between Heaven and Hell series — his first work of fiction. The eight-book series follows an Interpol commissioner and an Italian journalist across the cities of Europe, each book turning on one of the seven deadly sins and the specific shape that sin takes in a single human life.