Mescher, an engineer who specialized in HVAC but whose real forte was innovation, passed away in August. Mescher started Ground Source Heat Pump (GSHP) design in 1993, prior to ASHRAE publishing design criteria for GSHP. He designed and constructed his own test rig for ground thermal properties testing, developed the one-pipe distribution system for GSHP systems, and extended its application from individual building to campus scale. Mescher also pioneered ground-loop designs that eliminated the use of costly valve vaults and associated manifolds along with outside air-handling designs that permitted the use of standard heat pumps for this duty. His GSHP designs consistently achieved U.S. Environmental Protection Agency (EPA) scores in the 90th percentile. Active in ASHRAE at all levels, he achieved Fellow, Distinguished Service, and Exceptional Service statuses. He also served as chair of the Society Program Committee, Conferences Committee, TC 5.5 (Air-to-Air Heat Recovery), was a member of TC 6.8, and served as an ASHRAE Distinguished Lecturer.