Marina Sirtis is a British-American actress best known for her role as Counselor Deanna Troi on the television series Star Trek: The Next Generation. Born on March 29, 1955, in London, England, she studied at the Guildhall School of Music and Drama before pursuing a career in acting. In addition to her work on Star Trek, Sirtis has appeared in various films and television shows, including Ghosts of Mars and The Outer Limits. She has also lent her voice to numerous animated series and video games, showcasing her versatility as an actress.