Jessica Steen

In 1987, Steen was in the main cast of the syndicated series Captain Power and the Soldiers of the Future, which lasted one year. For her performance in the Captain Power episode, "Judgment", she was nominated for the Gemini Award in the "Best Performance by a Lead Actress in a Continuing Dramatic Role" category in 1988. In 1987, she played Tracy Steelgrave on Wiseguy.

While based in Toronto, Steen appeared on Canadian series and in American made-for-TV movies. In 1991, shortly after relocating to New York, she was cast on the soap opera Loving. She was in the main cast for the two season run of the series Homefront.

In 1994, she was cast as Dr. Julia Heller, a genetically enhanced doctor, in the science fiction series Earth 2. The show was canceled in 1995, after which Steen appeared in single episodes of various series, including The Outer Limits, ER, Murder One, Due South and Touched by an Angel. In 1994, she won the "Best Actress" Gemini Award, for her portrayal of Nora in the TV movie, Small Gifts.

In 1997, she was cast as District Attorney Elizabeth Gardner in the movie Trial & Error. Her performance earned a positive review from Roger Ebert on his syndicated show, Siskel & Ebert.

Producer Jerry Bruckheimer recommended her for the role of the shuttle pilot in 1998's Armageddon because he remembered her portrayal of Cpl. Jennifer 'Pilot' Chase in Captain Power and the Soldiers of the Future. In 2004 Steen played Dr. Elizabeth Weir in "Lost City", the two-part finale of season 7 of Stargate SG-1. In Stargate Atlantis, where the character was a main cast role, she was replaced by Torri Higginson. She played lead roles in Slap Shot 2: Breaking the Ice and the Disney TV movies Smart House and Principal Takes a Holiday.

She played Myra Teal in "Mr. Monk and the Billionaire Mugger", a 2002 episode of Monk. She played a recurring character on the CBS crime drama NCIS, that of Special Agent Paula Cassidy, from 2004 to 2007. In the fall of 2007 she appeared in a multi-episode role on the Canadian series, jPod. That same year, she appeared in the third episode of a new Canadian series, Heartland; as of 2024, the 18th season of the series Heartland, Steen continues to appear in the recurring role of Lisa Stillman.

Between 2009 and 2012, Steen had a recurring role as Strategic Response Unit Constable Donna Sabine, on the police drama Flashpoint. In 2010, she was nominated for a Gemini Award for Best Performance by an Actress in a Featured Supporting Role in a Dramatic Series, for her appearances in Clean Hands and The Perfect Family. She was nominated for a Canadian Screen Award in the category of Best Performance in a Guest Role, Dramatic Series for Flashpoint episode A New Life in 2013.

Between 2018 and 2020, Steen made several appearances in various Hallmark and Lifetime made-for-TV movies: A Midnight Kiss, Matching Hearts, Chateau Christmas, The Babysitter aka The Baby Monitor Murders, and Stolen by My Mother: The Kamiyah Mobley Story.