Douglas Steel, Ph.D. is a Translational Scientist with NeuroSense, a medical technology consultancy developing novel phototherapies for treating a number of nervous system conditions including PTSD, sensory processing disorders, migraine headache, depression, and emotional and stress-related conditions. Dr. Steel received his PhD in Biomedical Sciences from Columbia University.  Doug is a member of the IES Science Advisory Panel For the past several years he has been working on the development of spectrally-tunable LED lighting arrays, which can be used as an alternative to prescription drugs for the treatment of a number of neurological and psychiatric conditions.  He has a broad view of light and health that extends beyond just circadian response.  Please enjoy this conversation between Doug and Mark on timely issues in our lighting community.