In the late 1980s, Glover started his company, Volcanic Eruptions, which publishes his books and also serves as the production company for Glover's films, "What Is It?
Glover je najbolj znan po vlogi čudaških filmskih likov, kot sta na primer George McFly v filmu "Nazaj v prihodnost", Layne v "River's Edge", neprijateljski samotar Rubin Farr v "Rubin and Ed", »Creepy Thin Man« v filmski priredbi "Charliejevih angelčkov" in njenem nadaljevanju, Willard Stiles v remakeu "Willard", The Knave of Hearts v "Alici v čudežni deželi" in Phil v "Hot Tub Time Machine".