Threshold Stage Company is a professional theatre company in residence at the Star Theatre in Kittery, Maine.  

Founded by Heather Glenn Wixson and Peter Motson in 2014, Threshold provides intelligent, socially relevant, entertaining theatre to Southern Maine, the New Hampshire Seacoast and beyond.  

Heather Glenn Wixson Co-Artistic Director A member of Actors’ Equity and SAG/AFTRA, Heather is a graduate of NYU’s Tisch School of the Arts where she trained with Stella Adler and David Mamet. She has performed as an actor at many theatres on the east coast including LaMama Etc, Soho Rep, Huntington Theatre, WellFleet Harbor Actors’ Theatre, Lyric Stage, New Ehrlich Theatre, L/A Public Theatre, Penobscot Theatre, NHTP, Hackmatack Playhouse, Rochester Opera House, Palace Theatre and more. Favorite roles include Wanda in The Baby Dance, Karen in Speed-the-Plow, May in Fool for Love, Donna in Mamma Mia, Mary in Long Day’s Journey Into Night, and Elizabeth in The Crucible for which she won a Spotlight Award for Best Actress. She also appeared alongside David Mamet in an evening of his scenes and monologues at the Boston Center for the Arts and worked on several of his films. Heather has extensive on-camera and radio credits including principle work in LipService for HBO directed by WH Macy and Mina Harker in the 8 hour radio adaptation of Dracula for public radio.

Heather directed the award winning production of Mamet’s Glengarry Glen Ross for the Rochester Opera House as well as Richard Nelson’s Sorry and Mamet’s American Buffalo for Threshold Stage Company. Heather also works as a Theatre Educator and served as the Head of Theatre at Commonwealth School in Boston, Lead Artist-in-Residence at The Wang Center, and has received multiple grants to create theatre programs throughout the Greater Boston area. She has recently joined the faculty of Great Bay Community College where she will be teaching Acting. Heather also offers private coaching for Threshold Stage Actors Studio.

Peter Motson Co-Artistic Director Peter began performing professionally at age eleven soloing with the American Boychoir and has been seen in theaters and concert halls throughout the US including Princeton’s McCarter Theater, South Coast Repertory, New Jersey Shakespeare Festival and Glendale Civic Light Opera and has appeared in such roles as James Tyrone in Long Day’s Journey Into Night, Shelly Levine in Glengarry Glen Ross,  Michael in I Do! I Do!, Fancis Hardy in Faith Healer, Juror # 8 in Twelve Angry Men, Carl in The Baltimore Waltz, and Finch in How to Succeed…. He has appeared in a number of films including most recently The Anatomy of the Tide with Jamie-Lynn Sigler and John Shea, and Siren with Vanessa Shaw. On television he has been seen in numerous commercials and was the host\co-writer of an interview series focusing on the arts in Southern California.

He has also served as producer or co-producer on a number of theatrical productions and concerts across the country which, on the Seacoast, include Becky Shepard’s original musical One in a Million, Genevieve Aichele’s Resurrection and Metropolitan Opera Tenor Dennis William’s performance of Winterreise, and was the Associate Producer of Interplay Productions, an issue-oriented theater company for young audiences.

He graduated from the University of California Santa Barbara where he studied music composition with Peter Racine Fricker and Emma Lou Diemer.

Peter is a long-time member in good standing of Actors’ Equity and SAG-AFTRA.