Key-Thomas Märkl, born in 1963, received his first violin lessons from his father at the age of five. He continued his studies as a junior student with Saschko Gawriloff and Vesselin Paraschkevov and then spent seven years in the USA.
In the USA he first attended the Juilliard School of Music, New York, with Rami Shevelov and then spent four years with Shmuel Ashkenasi at the Northern Illinois University. He received chamber music instruction from members of the Juilliard, Vermeer and Guarneri Quartets as well as from Felix Galimir and as a student of the Tanglewood Festival with Leon Fleisher. After gaining his master of music degree he completed his studies with Arnold Steinhardt and Yuval Yaron.
Since 1990 he has been a member of the Symphonieorchester des Bayerischen Rundfunks and has taken part in many concerts and recordings in Germany and Europe. Regular string quartet tours have taken him to Iceland and the USA.