Stephanie studied with David Takeno at the Guildhall School of Music & Drama, with Dorothy DeLay at the Juilliard School, New York, and with Ilan Gronich at the Berlin Hochschule. Winner of the 1986 Shell LSO Competition, she has appeared as soloist with most of the leading UK orchestras as well as many abroad.
She is leader of the English Chamber Orchestra, and has both directed the orchestra and appeared as soloist with them throughout the world.
Recordings include the Sibelius Concerto for BMG and the Dvorak Romance with the ECO and Charles Mackerras.
Until 2002, Stephanie was leader of the Vellinger String Quartet, winners of the 1994 London International String Quartet Competition.