Dr. Geoff Miller joined Gibault as Principal in 2025. He has a B.A. in Philosophy and Religious Studies from Indiana University, an M.A. in Historical Theology from St. Louis University, and a Ph.D. in Biblical Studies from The Catholic University of America. Dr. Miller has twenty years of experience in Catholic education and seven years of experience in administration. He has taught at Catholic high schools in New York City, Kansas City, St. Louis, Memphis, Chicago, and Washington, DC. Most recently he was co-principal at St. Ignatius College Prep in Chicago.

Dr. Miller has three wonderful nieces who live in Missouri, and in his spare time he enjoys exercising, watching the Blues and Cardinals, and playing with his Basset Hound puppy.