Konstantin Stanislavski was a Russian actor and theatre director who developed the naturalistic performance technique known as the Stanislavski system, or method acting. Born in 1863, Stanislavski founded the Moscow Art Theatre in 1898, where he directed and acted in many plays. His innovative approach to acting emphasized emotional truth, realistic character portrayal, and internal psychological motivation. Stanislavski's teachings revolutionized the theatre world, influencing generations of actors and directors worldwide.