Mary Callahan is the Registrar and Senior Associate Dean at the Massachusetts Institute of Technology (MIT). She was named Registrar in 1999 and Senior Associate Dean in 2015 and sets the strategic direction for a continuum of student and faculty support activities. Among her many responsibilities are oversight of registration, grades, degree audits, tuition, and scheduling; supporting educational innovation through the curriculum development funds and programs that recognize excellence in teaching; serving as a partner in faculty governance; leading efforts to evolve the student systems; and helping senior administrators understand the character and impact of programs. She has received several MIT awards including the Billard Award for "special service of outstanding merit performed for the Institute," and two Institute Excellence Awards. Callahan recently served as Chair of the Association of American Universities Registrars and is a regular presenter at educational conferences. Her discussion about fraud prevention and the benefits of offering digital diplomas through the blockchain is available on the Helix Education podcast. This article presents an interview with Mary Callahan discussing her professional journey in higher education.