Rachel Emily Nichols was born in Augusta, Maine, the daughter of Alison and James Nichols, a schoolteacher. She has English, French Canadian, German, Irish, Italian and Scottish ancestry. She attended and graduated from Cony High School in Augusta, where she competed in the high jump. She attended Columbia University in New York City, where she eventually graduated with a double major in math and economics. She began modeling, launching a successful career with work for such high-profile companies as Guess?, Abercrombie & Fitch and L'Oréal.Rachel moved into acting, snagging a role on the HBO situation comedy Sex and the City (1998) with her very first audition. She made her film debut as Jessica Matthews in the prequel Dumb & dumberer - quand Harry rencontra Lloyd (2003). Success continued with roles in such projects as Amityville (2005), The inside - Dans la tête des tueurs (2005), Alias (2001), G.I. Joe - Le réveil du Cobra (2009), Esprits criminels (2005) (a recurring role as FBI Agent Ashley Seaver) and Conan (2011). She played the lead role of police officer Kiera Cameron on the science fiction series Continuum (2012).