Brennan is a Physical Therapist specializing in outpatient orthopedics. In 2010 he obtained his doctoral degree from Louisiana State University Heath Sciences in Shreveport and has fellowship training in Applied Functional Science through the Gray Institute. He is also Level 2 Certified in Functional Dry Needling. Brennan is an APTA Credentialed Clinical Instructor for physical therapy and physical therapist assistant students.

In his spare time, Brennan enjoys spending time with his wife, Amanda, and their 3 children (Parker, Graham, and Ella Claire). He also enjoys hunting, playing tennis, and being in the outdoors.