[1] After graduating from St. Francis Seminary in 1964, Glass attended the University of Evansville, where he received a Bachelor of Arts, double majoring in drama and literature.

[citation needed] Glass made his stage debut at the Guthrie Theater in Minneapolis, Minnesota, before moving to Hollywood.

On December 13, 1985, he played a soul-collecting devil opposite Sherman Hemsley's mathematics professor in an episode of the revived Twilight Zone series.

In 2008 he appeared in the film Lakeview Terrace alongside Samuel L. Jackson and starred in the 2010 version of Death at a Funeral as Duncan.

[citation needed] Glass never married, and though raised Catholic became a devout Buddhist, and a member of Soka Gakkai International.