- Was the model for the "Ian Miller" (John Corbett) character in My Big Fat Greek Wedding (2002), which was written by his wife, Nia Vardalos.
- Ian and Nia adopted a toddler daughter in 2008.
- Of Russian Jewish and Puerto Rican descent. He converted to the Greek Orthodox faith when he married Nia Vardalos.
- An alumnus of Chicago's ImprovOlympic improvisation troupe. Fellow members include the late Chris Farley, Jon Favreau, Pat Finn, Tim Meadows and Rachel Dratch.
- The New York native moved from Chicago in 1994 to try to get his big break, which occurred when he landed the recurring role on The Drew Carey Show (1995).
- His wife, Nia Vardalos, made a guest appearance as the wife of his character on Strange Bedfellows (1997).
- In 1993 he played in two separate movies where the stars of both movies had the same name Thomas Ian. First movie Excessive Force where the star of the movie was Thomas Ian Griffith, and the second movie The Rookie Of The Year where the star of the movie was Thomas Ian Nicholas.
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