After graduating with a degree in Choral Conducting at the University of Performing Arts (VSMU) in Bratislava under the tutelage of Prof. Peter Hradil, he also continued his studies of Gregorian Chant with Prof. J.Kohlhaufl at the University for Music and Darstellende Kunst in Vienna. He is the author of the first Slovak professional publication on Gregorian chant: ”Current Directions in Interpretation of Gregorian Chant“. He actively cooperates in the interpretation of Gregorian chant with Prof. Dr. F.K. Prassl from Graz and Prof. Dr. J.B. Goschl from Munich. Milan Kolena teaches choir conducting and Gregorian chant at VŠMU. Since 1998 Milan Kolena has been the Art Director of the International festivals in Bratislava. He is active as a Jury member at national and international choral competitions all over the world. He has led many workshops and seminars about vocal polyphony, Gregorian chant and Slovak contemporary music.
During 2004-2006 together with Schola Gregoriana Bratisalvensis recorded 3 CDs of Bratislava antiphons for Slovak National Library. Since 2013 he is the president of the Slovak Choral Association.
In 2014 he gave lectures at three American universities: Illinois Wesleyan University School, University of Missouri School of Music, Colorado State University on the The Question of the Interpretation of Latin texts in Sacred Choral Music. He was awarded the best conductor special prize of the „Singing World“ choral competition in St. Petersburg, Russia in 2015. In the same year he also did workshops in China and Hong Kong.