She graduated from the Acting Conservatory of the State University of New New York
She is also a speech coach. Sillas appeared in Hal Hartley"s 1992 film Simple Men. In Columbia Broadcasting System"s critically acclaimed detective series Under Suspicion, Sillas portrayed Rose Phillips, the only female detective in an otherwise male-dominated squad room.
She also starred in several miniseries for television, including Peter Benchley"s The Beast with William Petersen.
In the 1998-1999 prime-time television season, Sillas appeared on two of Columbia Broadcasting System"s most acclaimed series, Touched by an Angel and Promised Land. She also appeared on the hit Home Box Office series The Sopranos as.