Michniewski studied with Stanisław Wisłocki as well as Andrzej Dobrowolski at the State Music Academy in Warsaw.
[2] He won the 1977 Cantelli Award[3] and the bronze medal at Ernest Ansermet competition in Geneva the following year.
From 1984 to 1987 he was a permanent guest conductor of the Polska Orkiestra Kameralna and played a key role in its transfer to the Sinfonia Varsovia.
He directed the world premieres of the operas Wyrywacz serc by Elżbieta Sikora (1995), The Music Programme by Roxanna Panufnik (2000), and Ignorant i szaleniec by Paweł Mykietyn (2001) at the Teatr Wielki Michniewski.
[5] He was awarded the Fryderyk in 1996 for a recording of Witold Lutosławski's works and in 1999 for a gala concert with Rossini's music.