Studied at the K.Lipiński Music Academy in Wrcław under prof. Zdzisław Butom in 1989. While studying she perfected her skills taiking an active part in interpretation masterclasses and workshops under the guidance of such extrordinary cellist as Siegfried Palma, Ivan Monighetti, Andrzej Orkisz, Roman Suchecki, Marina Czajkowska and Bogumiła Reszke. From 1987, while she has been a student, she started a work at the State Musical secondary school of Karol Szymanowski in Wrocław as a cellist teacher, till 1996. After graduating in 1989, she accepted a job offer from her alma mater at the K.Lipiński Music Academy in Wrocław, where she became an assistant in the cello class, and futher in 1994 qualified as an adjunct with 1st level qualifications. In 2001 she gained the 2nd level qualifications and in December of 2014 she received the title of the Professor of Music Arts. From 2012 she is performing the deanship of the Instrumental Department,  and she is currently work her second term.
Prof. Urszula Marciniec-Mazur, while continuing teaching activity, she perform a numerous concert tours. Chamber music is her major specialization in the artistic activity. In 1987-2001 she performed with the Wrocław Chamber Orchestra Lepoldium, Opole Philharmonics, Wrocław Chamber Orchestra Wratislavia, and Menuhin Festival Orchestra. As the soloist of the Wrocław Chamber Orchestra Lepoldium, she cooperate with such great artists as Yehudi Menuhin, Jerzy Maksymiuk, Ewa Podleś, Konstanty Andrzej Kulka, Vadim Brodski, Jan Stanieda, Krzysztof Jabłoński.
Urszula Marciniec-Mazur is a constant member of the juries in national and international competitions and hearings. Moreover she is leading master classes and methodological workshops in cello playing and chamber music both in the country and abroad. In 2011 she was honoured Golden Cross of Merit by the President of The Republic of Poland. And in 2013 she received a medal Committee of the National Education.