sentences:  As well as intense bursts of creativity, Parsons suffered from what he described as "manic hysteria and depressing melancholy".His father Marvel, after suffering a near-fatal heart attack, died in 1947 as a psychiatric patient at St. Elizabeths Hospital in Washington D.C. diagnosed with severe clinical depression, a condition Pendle suggested the younger Parsons inherited.Parsons' obituary listed him as a member of the Army Ordnance Association, the American Institute of Aeronautics and Astronautics, the American Chemical Society, the American Association for the Advancement of Science, anddespite his lack of an academic degreethe Sigma Xi fraternity.