We are deeply saddened by the sudden death of Marcie Zinn, PhD, who was a dedicated researcher, advocate and person with myalgic encephalomyelitis (ME). Marcie died of sudden heart failure on Dec. 28, 2019.    Marcie and her husband, Mark, founded the Neurocognitive Research Institute (NCRI), a non-profit that specializes in 3D-mapping of the brain to