Robert Tewsley was born in Leicester, England and studied at the Royal Ballet School, London. In 1990, he became a member of the National Ballet of Canada where he was promoted to Soloist in 1993 and to Principal Dancer in 1994. Since then, he joined the Stuttgart Ballet (1996), the Royal Ballet (2002) and the New York City Ballet (2002) as a Principal Dancer.
Nowadays Robert Tewsley is a freelance dancer who regularly appears as a guest principal all over the world, for instance in New York, London, Tokyo, Stuttgart, Hamburg, Berlin, Munich, Moscow, Saint Petersburg, Milan, Rome, Vienna, Birmingham, Toulouse, Taipei, Sydney, Chicago, Toronto, Naples and Santiago de Chile.
In 2002, Robert Tewsley was elected "Dancer of the Year" by the European Dance Magazine Dance Europe. He also appeared on television in the ARTE production Penelope, a pas de deux created for Marcia Haydée and Robert Tewsley by Christian Spuck in 2006. More recently, he participated in the NHK “Super Ballet Lesson” series, where he was filmed in the Balcony Pas de Deux from Kenneth MacMillan’s Romeo and Juliet, partnering Miyako Yoshida. He also taught a ballet Master Class in Prague in August 2009.