The graduate seminars he teaches at NYU include Issues in the Conservation of Modern and Contemporary Art, the Conservation of Modern Sculpture, and Museum Conservation and Contemporary Culture.

Glenn began his conservation career as an archaeological and sculpture conservator in 1981. He worked as field conservator for the Sardis Expedition, the Institute of Nautical Archaeology, and the Princeton Cyprus Expedition at Polis. He held the position of Conservation Director at the Turkish Kaman-Kalehöyük excavation for the Middle Eastern Culture Center in Japan for thirteen seasons.

From 1986 – 1998 he ran a private practice in sculpture conservation. In 1998 his interest in public art led him to pursue a Ph.D. at the Institute of Archaeology, University College London. His dissertation is titled Heritage Conservation as Culture Work: Public Negotiation of a Pacific Hero. He used the conservation of the Kamehameha I monument in North Kohala, Hawai’i, to explore cultural relationships between the multi-cultural present and the Native Hawaiian past. The research engaged local residents in researching power dynamics at play in the conservation process.

He has served on professional committees for the American Institute for Conservation (AIC), the International Council of Museums – Conservation Committee (ICOM-CC), Heritage Preservation, Independent Media Arts Preservation (IMAP), the American Association of Museums (AAM), and the Western Association for Art Conservation (WAAC). He served as WAAC President in 1990-1991, and is currently on the AIC’s Publication Committee.