Konstantin Stanislavski (né Alexeiev; Russian: Константи́н Серге́евич Станисла́вский; 17 January [O.S. 5 January] 1863 – 7 August 1938) was a seminal Russian theatre practitioner. He was widely recognised as an outstanding character actor and the many productions that he directed garnered him a reputation as one of the leading theatre directors of his generation. His principal fame and influence, however, rests on his 'system' of actor training, preparation, and rehearsal technique.