His previous play, Freud's Last Session, premiered in the summer of 2009, also at the Barrington Stage Company, and had a long run at the New World Stages in New York City. Freud's Last Session began its New York previews on July 9, 2010, and officially opened on July 22, 2010. In April, 2011, Freud's Last Session won the Best Play Award from the Off Broadway Alliance.
In the summer of 2011, St. Germain's play The Best of Enemies premiered at the Barrington Stage Company in Pittsfield, Massachusetts. Based on the nonfiction book of the same name by Osha Gray Davidson, St. Germain's play dramatizes the relationship between C.P. Ellis (a local KKK leader) and Ann Atwater (an African-American civil rights organizer) during a racially tense period in the desegregation of Durham, North Carolina schools.
His relationship with Barrington Stage, the Pittsfield, MA regional theatre where virtually all of St. Germain's recent works have premiered, was memorialized in 2012 when the troupe's Stage 2 venue was renamed the St. Germain Stage.
- Scott and Hem in the Garden of Allah, premiering in August, 2013, explores an evening at Los Angeles' notorious Garden of Allah apartments with F. Scott Fitzgerald and Ernest Hemingway.
In 2014, St. Germain premiered his eighth play, Dancing Lessons at Barrington Stage Company. The play will be presented from January 6 - February 7, 2016 at Orlando Shakespeare Theater as part of their 2015-16 Signature Series. The show has recently been produced at Florida Studio Theatre in Sarasota, Florida as a part of their 2014-2015 Mainstage Season. Florida Studio Theatre has partnered with Mr. St. Germain to workshop many of his works in progress.
His television credits include The Cosby Show (Writer/Creative Consultant), Crime and Punishment and The Wright Verdicts. He co-wrote the screenplay for Carroll Ballard’s Duma. He was also a script Writer on the CBS Daytime serial As the World Turns.