Sofia Vassilieva is an American actress best known for her starring role as Ariel Dubois in the supernatural drama television series Medium, from 2005-2011.
She was born in Minneapolis, Minnesota to Dr. Larissa Vassilieva and Vladimir Vassiliev, Russian immigrant scientists from Akademgorodok in Novosibirsk.
At the age of 7, she was discovered at the International Modeling and Talent Association (IMTA) in New York where she won the title of Child Actress and first runner-up Child Model Of The Year 2000.
In less than one year she had the part of Elena - the granddaughter of a retired Russian General in the episode "Deadline" of the CBS TV series The Agency (2001-2003).
At the age of 9 she played Cindy Brady in The Brady Bunch in the White House (2002) opposite Shelley Long and Gary Cole, and a little girl named Gina in Inhabited (2003) opposite Malcolm McDowell and The Bad Seed's former child actress Patty McCormack.
At the age of 9 and 10 she played the children's book heroine Eloise, in two made-for-television movies Eloise at the Plaza and Eloise at Christmastime. Both films were directed by Kevin Lima.
At 11, Sofia began playing the role of Ariel DuBois in Medium.
She was a presenter of Family Feature Film on the Humane Society's 19th Genesis Awards in 2005 and was nominated in 2005 for a SyFy Portal Genre Award as best young actor/actress for her role in Medium (but lost the award to Harry Potter's Daniel Radcliffe).
She won a Young Artist Award in 2006 for best supporting actress in a TV Drama for her role in Medium.
In 2007 she appeared in the feature film Day Zero, with Elijah Wood, Chris Klein, Ginnifer Goodwin, Jon Bernthal, Ally Sheedy, and Elisabeth Moss.
In 2008 Sofia will be starring in the independent feature Hurt (2008), along with Melora Walters, William Mapother, Johanna E. Braddy and Jackson Rathbone, directed by Barbara Stepansky.
Vassilieva is a polyglot - she speaks English, Russian and French fluently and is learning Spanish. As Ariel Dubois, she did promotions for the 3rd season of Medium in French for French speaking countries and in Russian for Russia.