His postdoctoral work was conducted under the supervision of Gordon Broderick, Ph.D., in the Broderick Laboratory for Clinical Systems Biology in the Department of Medicine, Faculty of Medicine and Dentistry at the University of Alberta. His work with Gordon Broderick, Ph.D., focused on using a theory driven systems biology approach to investigate neuroendocrine-immune interaction dynamics in neuro-inflammation and its relation complex diseases such as Gulf War Illness, and chronic fatigue syndrome. This work was funded by the U.S. Department of Defense. Craddock contributed the book chapter "The “Quantum Underground”: Where Life and Consciousness Originate" to Biophysics Of Consciousness: A Foundational Approach (2016).