Karol Mossakowski is renowned for both his interpretation and improvisation skills. He has shaped his deep musical personality since the age of three, when he began to study the piano and the organ with his father. After musical studies in Poland with Elżbieta Karolak and Jarosław Tarnawski, he entered the organ, improvisation, and composition classes at the Paris Conservatory as a student of Olivier Latry, Michel Bouvard, Thierry Escaich, Philippe Lefebvre and László Fassang.
Among the many prizes he was awarded, he won the first prize of the International Prague Spring Competition, and the Grand Prix de Chartres in 2016, one of the most prestigious international competitions. In 2010, he won the international Competition Feliks Nowowiejski in Poznań. In 2015, he was awarded the Grand Prix and the Prix du Public of the Jean-Louis Florentz international Competition in Angers by the Beaux-Arts Academy in Paris, and the Grand Prix André-Marchal in Biarritz. In 2016, he won the Prix international Boëllmann-Gigout in Strasbourg. That same year, he was awarded the « Debiut Roku » prize of the Music and Dance Polish National Institute.
In 2014-15 Mossakowski was appointed Young Artist in Residence at Cathedral of St. Louis King of France in New Orleans (USA), where he performed many recitals and taught interpretation and improvisation lessons.
For Karol Mossakowski it is essential to support living music thanks to improvisation, to which he gives an important role in his recitals and develops by accompanying silent films. Thus, much sought for his improvisation talent, he recently performed ciné-concerts at La Rochelle’s International Film Festival, or at the Festival Lumière in Lyon during which he improvised on Dreyer’s Jeanne d’Arc at Lyon’s Auditorium. In 2017 he released a DVD of this performance on Gaumont-Pathé.
He is titular organist of Lille’s Cathedral, and teaches organ and improvisation at the Hector Berlioz Conservatory in Paris.Since September 2019 he also is appointed Organist in Residence at the Maison de la Radio (Radio France) where he presides over the concert hall organ built by Gerhard Grenzing.