Jonáš Krejčí, violoncello, was born in London and raised in Prague. He studied at the Prague Conservatory, and spent a year in London studying with William Pleeth. He received a scholarship from the University of Southern California, where he studied for four years with Lynn Harrell. During his time in Los Angeles, he performed in the Los Angeles Philharmonic Institute and the New York String Orchestra. After completing his studies, he returned to Europe. As a member first of the Škampa Quartet and then of the Petersen Quartet and Schulhoff Quartet, he has appeared in major concert venues throughout the world, such as Carnegie Hall and the Lincoln Center in New York, the Philharmonie in Berlin, the Concertgebouw in Amsterdam, and the Musikverein and Konzerthaus in Vienna.
He is prinicipal cellist of the Vienna Chamber Orchestra, and has played with the Vienna Philharmonic Orchestra. He is also active as a soloist. Additionally, he has given masterclasses at the Royal Academy of Music in London, the Winterthur Conservatory in Switzerland, and in the USA, the Czech Republic and Japan.