John Alan Glennon (born September 24, 1970) is an American geographer and explorer. His work has been mapping and describing caves and geysers. Discoveries and research Caves In 1996, Glennon and Jon Jasper discovered an entrance to the Martin Ridge Cave System, Kentucky, and explored connections to nearby Jackpot and Whigpistle Caves (Groves, C.G. 1998). The combined cave system is long (Gulden, B. 2005). The cave is hydrologically connected to Mammoth Cave---the world's longest cave (Quinlan J.F. and Ray, J. 1989). Glennon also was involved in the discovery of one of the largest cave chambers in Kentucky (Yonker, R. 2003). Geysers In 2002, Glennon led an American expedition to El Tatio Geyser Field, Chile. The team produced the first comprehensive inventory and description of the geysers' behaviors. The resulting report concluded that the site was the world's third largest geyser field (Glennon, J.A. and Pfaff, R.M. 2003). Hoffman Environmental Research Institute (HERI) With Dr. Chris Groves, president of the Cave Research Foundation (2004-2006), Glennon cofounded HERI in 1999. The Institute's mission is to study the environmental and geologic aspects of caves and karst landscapes. Headquartered at Western Kentucky University, HERI's major scientific focus has been on the karst issues of China. Background Glennon was a geography Ph.D. student of Dr. Michael Frank Goodchild at the University of California, Santa Barbara and received his PhD in 2013. Goodchild is a pioneer in Geographic Information Science and discoverer of Castleguard Cave, Canada's longest cave. Glennon received a Master of Science in Geoscience from Western Kentucky University, 2001, and Bachelor of Science in Park Administration from Texas A&M University, 1994. For his cave discoveries in Kentucky, Alan has been commissioned in the Honorable Order of Kentucky Colonels. Works authored Glennon, J.A., Pfaff, R.M. (2005). The operation and geography of carbon-dioxide-driven, cold-water geysers, GOSA Transactions, vol. 9, pp. 184–192. Glennon, J.A., Pfaff, R.M. (2003). The extraordinary thermal activity of El Tatio Geyser Field, Antofagasta Region, Chile, GOSA Transactions, vol 8. pp. 31–78. Glennon, J.A. (2001). Application of Morphometric Relationships to Active Flow Networks within the Mammoth Cave Watershed, M.Sc. Thesis, Bowling Green: Western Kentucky University, 87 p (includes a description of the discovery of Martin Ridge Cave). Gulden, B. (2005). USA longest caves. National Speleological Society GEO2 Committee. (web). Groves C.G. (1998). The Martin Ridge Cave System, Cave Research Foundation Newsletter. Quinlan, J. F. and Ray, J. (1989). Map of groundwater basins, surface drainage,