Keith received his Bachelor of Science in physics in 1995. He received his Master of Science degree in 1998 and completed his Medical Physics Residency from the University of Kentucky in 2001. He has been at the James Graham Brown Cancer Center for over 20 years. He is certified through the American Board of Radiology (DABR). He has presented at various scientific symposiums over the years. He has also co-authored numerous publications. He is a member of the American Association of Physicists in medicine. He enjoys cycling and video games, along with spending time with his fiancée and two daughters.