- Played Catherine opposite Peter Weller and Harris Yulin in "Frank's Home" by Richard Nelson at Playwrights Horizons Theater, New York (2007).
- Played Thomasina in "Arcadia" by Tom Stoppard at the Wilma Theater, Philadelphia (1997)
- Appeared in "Oleanna" by David Mamet at the Walnut Street Theatre Studio 3, Philadelphia (directed by William Roudebush, 1997)
- Appeared in "Aunt Dan & Lemon" by Wallace Shawn at the InterAct Theatre Company, Philadelphia (1998)
- Appeared in "Ghosts" by Henrik Ibsen at the Lantern Theater Company, Philadelphia (1998)
- Played Matron and Julia in "Meanwhile, on the Other Side of Mount Vesuvius" by Jay Reiss at the Adobe Theater Company, New York (directed by Damon Kiely, 1999).
- Played Lulu in "The Ruby Sunrise" by Rinne Groff at The Public Theatre, New York (directed by Oskar Eustis, 2005).
- (2005) She acted in Rebecca Gilman's new adaptation of the play, "Dollhouse" at the Goodman Theatre in Chicago, Illinois with Lance Stuart Baker in the cast.
- (February 2, 2013 - April 6, 2013) Stage play: Much Ado About Nothing by William Shakespeare - playing Beatrice (with Jonathan Cake as Benedick), at Theater for a New Audience/The Duke on 42nd Street, New York (directed by Arin Arbus)
- (2012) The Taming of The Shrew at Duke Theatre NYC Maggie is Kate
- (2018) TV Commercial, "Outsmart Average." Betterment, an online financial advisor.
- (May 26, 2020 - July 28, 2020) Podcast: "You Must Remember This -- Polly Platt: The Invisible Woman," playing the voice of production designer, writer, and producer Polly Platt. Siff's lines are based in large part on Platt's unpublished memoir, "It Was Worth It."
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