 He has been a prominent researcher in the field of nuclear medical brain imaging and neurotheology.In particular, his research has focused on the development of neurotransmitter tracers for the evaluation of religiosity as well as neurological and psychiatric disorders including clinical depression, head injury, Alzheimer's disease, and Parkinson's disease.His book Principles of Neurotheology gives a basic understanding on the research done so far on Neurotheology.