Born in an intellectual family. His father, Stanisław, was a renowned pianist, a pupil of Józef Turczyński. His mother, Jadwiga (neé Łaska) was a singer and a pupil of Ada Sari.
He commenced his music education at the age of six, learning to play the piano under the tutelage of his father. That year marked his first public performance in the Chamber Hall of the National Philharmonic in Warsaw, where he played one of the early polonaises (in B-flat major) by Fryderyk Chopin.
Staniewicz ultimately decided to take up the violin, initially working under the tutelage of Zygmunt Piórkowski at the Karol Szymanowski State Primary Music School in Warsaw and from 1970 (while still in the Secondary Music School in Warsaw and then at the Warsaw Higher School of Music) under the direction of Professor Zenon Brzewski.
He has also participated in International Music Interpretation Courses (playing in the finals stage concerts for participants with distinctions), working with such teachers as Jean Fournier and Wolfgang Marschner (solo violin performance) and Kurt Lewin (chamber music).
Staniewicz has worked together with Jerzy Maksymiuk’s Polish Chamber Orchestra since 1974, initially as a member of the orchestra and then as soloist, performing the solo parts in Haendel’s and Corelli’s Concerti Grossi, as well as in Bach’s Concerto for two violins with three renowned concert masters of the Polish Chamber Orchestra as partners: Zbigniew Czapczyński, Grzegorz Rezler, and finally Jan Stanienda (ca. 60-70 concerts overall, performed in Stockholm, Nantes, Bath (at the Yehudi Menuhin Festival), Edinburgh, Nottingham, Perth, Washington (Kennedy Center), London (Wigmore Hall, Queen Elisabeth Hall) and at the National Philharmonic in Warsaw.
He played under the direction of Neville Marriner, holding the position of second violin concert master.
After the transformation of the Polish Chamber Orchestra into the Sinfonia Varsovia Orchestra, Staniewicz was invited by director Franciszek Wybrańczyk to play first violin, a position he holds to date, being the second musician in both ensembles (the Polish Chamber Orchestra and the Sinfonia Varsovia Orchestra) in terms of length of employment. He has participated in nearly all significant achievements of the orchestras – in terms of both recording and live performance.
Andrzej Staniewicz was twice awarded by Ministers of Culture with the Culture Order of Merit and with the Order of Merit for Polish Culture (1985, 2004). For his activity he has received the Bronze Cross of Merit (2015).