Glass made his stage debut at the Guthrie Theater in Minneapolis, Minnesota before moving to Hollywood.
His earliest TV appearances include episodes of Sanford and Son in 1972, an episode of Hawaii Five-O in 1973,an episode of Maude in 1973, an episode of All in the Family in 1973, an episode of The Bob Newhart Show, and episodes of Good Times in 1974.
In 1975, he landed the role of Det.
Ron Harris in Barney Miller, which ran until 1982.

The following season, Glass also co-starred with Demond Wilson on television in a remake of The Odd Couple, called The New Odd Couple.
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 1992, he co-starred in the sitcom Rhythm and Blues, a kind of "black WKRP", playing "the fifth Top" opposite Roger Kabler.

In 1996, Glass was cast as uptight history teacher Roland Felcher in NBC sitcom Mr. Rhodes opposite comedian Tom Rhodes.
In 1999, he appeared in two episodes of NBC sitcom Friends as Ross Geller's divorce lawyer, Russell.

After that, Glass appeared in dozens of television series, including sitcoms such as Family Matters and the series Teen Angel, where he played God's cousin Rod.
He had a guest appearance in the Star Trek: Voyager episode "Nightingale".
He was a series regular in the science fiction series Firefly (2002) and the sequel film Serenity (2005), in which he played Derrial Book, a Christian "Shepherd" with a mysterious past.
Glass provided the voice of Randy Carmichael for the Nickelodeon series All Grown Up!
and Rugrats, and the character Garth in the video game Fable II.
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.
Glass made his stage debut at the Guthrie Theater in Minneapolis, Minnesota before moving to Hollywood. His earliest TV appearances include episodes of Sanford and Son in 1972, an episode of Hawaii Five-O in 1973,an episode of Maude in 1973, an episode of All in the Family in 1973, an episode of The Bob Newhart Show, and episodes of Good Times in 1974. In 1975, he landed the role of Det. Ron Harris in Barney Miller, which ran until 1982. 
The following season, Glass also co-starred with Demond Wilson on television in a remake of The Odd Couple, called The New Odd Couple. 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 1992, he co-starred in the sitcom Rhythm and Blues, a kind of "black WKRP", playing "the fifth Top" opposite Roger Kabler. 
In 1996, Glass was cast as uptight history teacher Roland Felcher in NBC sitcom Mr. Rhodes opposite comedian Tom Rhodes. In 1999, he appeared in two episodes of NBC sitcom Friends as Ross Geller's divorce lawyer, Russell.
After that, Glass appeared in dozens of television series, including sitcoms such as Family Matters and the series Teen Angel, where he played God's cousin Rod. He had a guest appearance in the Star Trek: Voyager episode "Nightingale". He was a series regular in the science fiction series Firefly (2002) and the sequel film Serenity (2005), in which he played Derrial Book, a Christian "Shepherd" with a mysterious past. Glass provided the voice of Randy Carmichael for the Nickelodeon series All Grown Up! and Rugrats, and the character Garth in the video game Fable II. 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.
Ron Glass