Born into a Polish Chicagoan family, blonde-haired and baby-faced actress Nina Siemaszko began life as Antonina Jadwiga Siemaszko in 1970. Though she initially harbored no definite plans to pursue acting professionally, Nina -- the sister of actor Casey Siemaszko (Stand by Me, Young Guns) --unexpectedly broke into show business by goofing off in front of her sibling's agent (and reportedly poking fun at Casey); it so impressed the agent that he signed her not long after. She landed her first significant role as the onscreen sister of teen heartthrob Corey Haim in 1988's License to Drive, then acted for the eminent Francis Ford Coppola in that helmer's 1988 pet project, Tucker: The Man and His Dream (as Preston Tucker's teenage daughter). For better or worse, Siemaszko subsequently had to endure a string of less-than-prestigious projects, including the 1992 softcore melodrama Wild Orchid 2: Two Shades of Blue (as the lascivious title character) and the 1994 telemovie Baby Brokers, as a sleazy con-woman who joins her husband in luring childless victims into a phony adoption scheme. Siemaszko took a massive step up (in prestige and visibility) with a key supporting role in the Rob Reiner/Aaron Sorkin comedy-drama The American President (1995), played Mona Ramsey in the acclaimed miniseries More Tales of the City (1998), and, around the middle of the following decade, played a recurring role as an amateur detective's (Kellie Martin) close friend, in the "Mystery Woman" series of telemovies. In 2008, Siemaszko signed on for a supporting turn in the teen-oriented shocker The Haunting of Molly Hartley. Siemaszko's resumé also includes guest spots on series such as Judging Amy, The West Wing, and Red Shoe Diaries (which reunited her with Orchid director Zalman King).