Born in 1992, in Oleśnica, Karol Mruk began his studying guitar at the age of nine. Kornelia Sulińska and Anna Pietrzak became his first guitar mentors. He finished Fryderyk Chopin School of Music in Oleśnica and then Karol Szymanowski School of Music in Wroclaw where he was a pupil of renowned polish guitar professor Marek Zieliński. In 2015 Karol graduated with distinction, after five years of studies with Łukasz Kuropaczewski at the I.J.Paderewski Academy of Music in Poznań. Apart from solo studies in 2017 he completed the postgraduate program in chamber music at the Royal Danish Academy of Music in Copenhagen (Denmark), as a member of Erlendis Quartet, studying with prof. Jesper Sivebaek and prof. Tim Frederiksen.

Karol is the prizewinner of over 15 music competitions in Europe (Guitar contests in Gorizia, Beograd, Poznań, Krynica-Zdrój and many others). His concert appearances include Poland, Denmark, Sweden, Ukraine, Latvia, Germany, Austria, Serbia, Italy, Spain, Canada and USA.

Along with the Erlendis Quartet, he is actively playing concerts around most of the European countries, USA and Canada. As a chamber music ensemble, they collected an impressive number of prizes, including 1st prize at the GFA International Chamber Music Competition in Fullerton, California, 1st prize at the Danish Radio P2 Chamber Music Competition in Copenhagen, 1st prize at the Chamber Music Competition in Aschaffenburg, and many more.

Karol had been invited to work as a jury member in several music competitions in Poland and the USA. He complemented his education by participating also individually in masterclasses conducted by widely recognized musicians e.g Manuel Barrueco, Marcin Dylla, Łukasz Kuropaczewski, Bartłomiej Nizioł, Zoran Dukić, Jeremy Jouve, Judicael Perroy and many others. In march 2013, along with Łukasz Kuropaczewski, he became invited to play a private concert for the President of Poland in Presidential Palace in Warsaw. In addition, Karol received many scholarships from President of Wroclaw, Minister of Science and Higher Education and Minister of Culture of Poland Bogdan Zdrojewski.

He currently lives in Aarhus, Denmark, where he works as a guitar teacher in Herning Musikskole.

Op zondag 2 februari 2020 treedt Karol als lid van het Erlendis Quartet op in de kerk van Mook.