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1990 – 1996
Conservatory in Bratislava (composing – Peter Martinček, conducting – J. Karaba)
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1996
summer conducting courses with R. Houlighan, A. Wilheima in Szombathely, Hungary
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1996 – 2002
Academy of Performing Arts in Bratislava (composing – Vladimír Bokes, conducting – Bystrík Režucha, Róbert Stankovský, Stanislav Macura)
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1998
Summer academy – composing courses with E. Urbannera in Reichenau, Austria
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1999 – 2000
EDDC School workshops in Arnhem, Netherlands: music for dance performances
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2000
Summer composing courses in Český Krumlov (M. Kopelent, P. Kotík, M. Hermann)
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2001, 2003
CASMI – composition courses in Prague (L. Kubik)
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2001, 2003
OCNMH composition seminars in Ostrava (Ch. Wolff, A. Lucier, T. Murail, P. Niblock, J.-Y. Bousser, P. Kotik)
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2002 – 2005
postgraduate student of composing at the APA with Vladimír Bokes
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2003, 2004
assistant of Zsolt Nagy by Janáček Philharmonic Ostrava (OCNMH '03, Maerz musik '04)
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2004 – 2010
postgraduate student of conducting at the APA in Bratislava with Ondrej Lenárd
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since 2006
guest conductor in the Opera of the Slovak National Theatre in Bratislava
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2007 – 2014
conductor of Opera Studio at Academy of Performing Arts in Bratislava
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since 2010
pedagogue of composition and conducting at the Academy of Performing Arts in Bratislava
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since 2014
main conductor of the ensemble Prague Modern
Márian Lejava is one of the establish-members and dramaturgist of association SOOZVUK. As a conductor he has collaborated, among others, with the Slovak State Philharmonic Košice, Slovak Sinfonietta Žilina, Janáček Philharmonic Ostrava, Orchestra lyrique et symphonique de Nancy, Savaria Symphony Orchestra Szombathely, ZOE Chamber Orchestra, wit the ensembles Melos Ethos Ensemble, VENI ensemble, VENI ACADEMY, Bratislava Convergence Players, Qaartsiluni Ensemble, Ensemble modern Frankfurt, Ensemble Resonance Freiburg.