Dr. Millis is a Knoxville, Tennessee native and a graduate of the University of Tennessee, where he earned a Bachelor of Science in Biochemistry, Cellular, and Molecular Biology before obtaining his Doctor of Veterinary Medicine degree from the University of Tennessee College of Veterinary Medicine. He completed a small animal internship at Veterinary Care and Specialty Group.
Following his internship, Dr. Millis joined the faculty at the University of Tennessee College of Veterinary Medicine as a Clinical Instructor in Emergency and Critical Care. He later returned to Veterinary Care and Specialty Group to pursue a surgical residency.