In 2002, Glennon led an American expedition to El Tatio Geyser Field, Chile.
The resulting report concluded that the site was the world's third largest geyser field (Glennon, J.A.
With Dr. Chris Groves, president of the Cave Research Foundation (2004-2006), Glennon cofounded HERI in 1999.
Headquartered at Western Kentucky University, HERI's major scientific focus has been on the karst issues of China.
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.