Nina Siemaszko began acting at age four in a Chicago production of "The Sound of Music" and then continued to hone her craft as a child performer at the city's Polish-language RefRen Theatre. As she has matured, the petite attractive actress has carved a career alternating between leading and supporting roles on television and in both studio fare and independent films. Siemaszko made her feature debut in the best-forgotten "One More Saturday Night" (1986) before appearing in the teen romp "License to Drive" (1988), with Corey Haim and Corey Feldman. In 1989, she made her small screen debut in a small role in the acclaimed CBS miniseries "Lonesome Dove". Her turn as an alluring teen who turns to prostitution in "Wild Orchid II: Two Shades of Blue" didn't win her any critical praise but she was did garner some notice as Talia Shire's daughter in "Bed and Breakfast" (both 1992) and as Mia Farrow in the CBS biography "Sinatra" (also 1992). Siemaszko had one of her better roles as a pregnant squatter in "The Saint of Fort Washington" (1993) Projects like the cult films "Floundering" and "Airheads" (both 1994) followed but did little to advance her career. She turned mainstream to play Annette Bening's sister in the comedy "The American President" (1995), which proved to be a box office disappointment. A further setback was the busted pilot "The Pastor's Wife" (1995), scripted by David E Kelley, in which she had the title role. It took another indie role, though, for the actress to earn glowing notices as a contemporary gold-digger in "George B." (1997) opposite David Morse. That same year, she starred as a klutzy nurse whose automobile goes out of control in the Fox TV-movie "Runaway Car". More recently, Siemaszko assumed the role of Mona Ramsay (created by Chloe Webb) in the sequel "Armistead Maupin's 'More Tales From the City'" (Showtime, 1998) before lending support to Robin Williams in "Jakob the Liar" (1999).

source movies.yahoo.com

  "The West Wing"
- Requiem (2006) TV Episode .... Ellie Bartlet
- The Wedding (2005) TV Episode .... Eleanore 'Ellie' Bartlet
- Undecideds (2005) TV Episode .... Eleanore 'Ellie' Bartlet
- Here Today (2005) TV Episode .... Ellie Bartlet
- Eppur Si Muove (2004) TV Episode .... Ellie Bartlet
(4 more)
"Cold Case"
- Superstar (2006) TV Episode .... Julie Vera
Mystery Woman: Wild West Mystery (2006) (TV) .... Cassie
Mystery Woman: At First Sight (2006) (TV) .... Cassie Hillman
Mystery Woman: Redemption (2006) (TV) .... Cassandra Hillman
Mystery Woman: Game Time (2005) (TV) .... Cassandra Hillman
Mystery Woman: Vision of a Murder (2005) (TV) .... Cassandra Hillman
Mystery Woman: Sing Me a Murder (2005) (TV) .... Cassandra Hillman
Mystery Woman: Snapshot (2005) (TV) .... Cassandra Hillman
Mystery Woman: Mystery Weekend (2005) (TV) .... Cassandra Hillman
Grand Theft Auto: San Andreas (2004) (VG) (voice) .... Pedestrian
... aka GTA: San Andreas (International: English title: short title) (USA: short title)
... aka San Andreas (International: English title: short title) (USA: short title)
... aka GTA 4 (USA: short title)
... aka Grand Theft Auto V (USA)
"CSI: Crime Scene Investigation"
... aka C.S.I. (USA: short title)
... aka CSI: Las Vegas (USA: syndication title)
... aka CSI: Weekends (USA: promotional title)
... aka Experts, Les (Canada: French title)
- Bloodlines (2004) TV Episode .... Linley Parker
"Judging Amy"
- Baggage Claim (2004) TV Episode .... Christy Wolinsky
A Carol Christmas (2003) (TV) .... Roberta
"Philly"
- Fork You Very Much (2001) TV Episode .... Teresa Wyatt
"The Guardian"
- The Men from the Boys (2001) TV Episode .... Nina Siemaszko
"NYPD Blue"
- Family Ties (2001) TV Episode .... Debra
The Darkling (2000) (TV) .... Marla Obold
"The Huntress"
- Springing Tiny (2000) TV Episode .... Dorinda Patterson
Sleep Easy, Hutch Rimes (2000) .... Holly Proudfit

The Big Tease (1999) .... Betty Fuego
"Cold Feet"
- How Much Is That Sex Act in the Window (1999) TV Episode .... Bob
Jakob the Liar (1999) .... Rosa Frankfurter
... aka Jakob le menteur (France)
"Sports Night"
- What Kind of Day Has It Been? (1999) TV Episode .... Holly
"More Tales of the City" (1998) (mini) TV Series .... Mona Ramsey
... aka Armistead Maupin's More Tales of the City
Goodbye Lover (1998) .... Newscaster
Paperlily (1998)
Breast Men (1997) (uncredited) .... Upset Lady at the Convention
Suicide Kings (1997) .... Jennifer
Runaway Car (1997) (TV) .... Jenny Todd
... aka Out of Control
George B. (1997) .... Angela
Johns (1996) .... Tiffany The Prostitute
Kiss & Tell (1996) .... Shelly
Love and Happiness (1995) .... Nina
The American President (1995) .... Beth Wade
Sawbones (1995) (TV) .... Jenny Sloan
... aka Prescription for Murder
... aka Roger Corman Presents Sawbones (USA: cable TV title)
Power of Attorney (1995) .... Maria
"Chicago Hope"
- You Gotta Have Heart (1994) TV Episode .... Gloria McKinnon
Airheads (1994) .... Suzzi
Baby Brokers (1994) (TV) .... Leeanne Dees
Floundering (1994) .... Gal
Red Shoe Diaries 3: Another Woman's Lipstick (1993) (V) .... Trudy (segment "Just Like That")
"Tales from the Crypt"
... aka HBO's Tales from the Crypt
- Creep Course (1993) TV Episode .... Stella Bishop
The Saint of Fort Washington (1993) .... Tamsen, Rosario's Girl
Twenty Bucks (1993) .... Bank Teller
Sinatra (1992) (TV) .... Mia Farrow
Bed & Breakfast (1992/I) .... Cassie
Wild Orchid II: Two Shades of Blue (1992) .... Blue McDonald
... aka Wild Orchid 2: Blue Movie Blue
"Red Shoe Diaries"
- Just Like That (1992) TV Episode .... Trudy
Little Noises (1991) .... Dolores
An Enemy of the People (1990) (TV) .... Polly Stockman

Lost Angels (1989) .... Merilee
"Lonesome Dove" (1989) (mini) TV Series .... Janey
Tucker: The Man and His Dream (1988) .... Marilyn Lee Tucker
License to Drive (1988) .... Natalie
One More Saturday Night (1986) .... Karen Lundahl