Key-Thomas Märkl was born in 1963 and is the son of a Japanese pianist and German violinist. He studied with Rami Shevelow at the Juilliard School in New York and continued his studies with Shmuel Ashkenasi of the Vermeer Quartet. Since 1990 he has been a member of the Bavarian Radio Symphony Orchestra in Munich, as well as the Bavarian Radio Chamber Orchestra.
He is in demand as a soloist and has been invited to play chamber music in concert halls throughout Germany and Europe. String quartet tours have taken him to Iceland and America. He has recorded many chamber works for the Bavarian Radio and the Col legno label. In 2010 he joined the faculty of the Music Conservatory in Munich, Germany. In 2015 he founded together with his wife Kim Maerkl the label Atlantic Crossing Records.