Prior to joining Nativity in 2005, Greg had been serving as coordinator of programs for the Jesuit high schools of the Missouri and Wisconsin provinces of the Society of Jesus. He is a former principal and educator at Marquette University High School with a 30-year tenure.

A Milwaukee native, he is an alumnus of Marquette High School. He holds a Bachelors Degree from Saint Louis University and a Masters Degree from Marquette University. He and his wife, Kathy, have four adult sons – one of which (John) is a Nativity faculty member.