Gus Castellanos, M.D. attended the University of Miami undergraduate and Medical School, receiving his M.D. degree in 1980. He trained at Emory, Georgetown Universities, and completed a Neuro-Oncology Fellowship and research at MD Anderson Tumor Institute, Houston. He received board certification in Neurology in 1987 and in Sleep Medicine in 1994. He practiced medicine in South Florida, until retiring in Jan. 2007 to pursue his interests in meditation and metaphysical studies.

Gus is now a Mindfulness Based Stress Reduction (M.B.S.R.) facilitator & meditation teacher, trained by the University of Massachusetts’ Center for Mindfulness. He currently teaches at the Sari Asher Center for Integrative Cancer Care, U Health Fitness Center (U of Miami Medical Wellness Center), and The Wellness Center at Ultima Fitness and has taught at the Hanley Center, A New Day Treatment Center, Jupiter Medical Center, Hospice of Palm Beach County, U.S. Army and Kula Yoga Shala. He is the volunteer mindfulness instructor for South Bay Correctional Facility and serves as an advisor to Integrative Medicine Department at Jupiter Medical Center and is currently involved in mindfulness research with the Mindfulness Based Attention Training program at the University of Miami Neuroscience Lab.