[1] Upon completing his formal education, Brennen accepted a faculty position at the University of Georgia School of Law from 2006 until 2009.
He eventually left the institution to become dean of the University of Kentucky College of Law.
[2] While serving in this role, he was selected for the American Council on Education (ACE) Fellowship program [3] and named to the Lawyers of Color's Fourth Annual Power List.
[4] In 2019, Brennen was elected vice president/president-elect of the Southeast Association of Law Schools.
[5] During his year with the ACE's Fellowship program, Mary J. Davis took over as interim dean of the University of Kentucky College of Law.