From his very earliest days in office, Tony Blair believed that if he was to achieve his broader educational reforms then the teaching profession itself needed modernising--it had to become a "21st century profession". This paper charts the background to this aspiration and the complex range of interrelated policies used to achieve that reform. They included: a changed role for initial teacher education; a more differentiated workforce; strategies to "focus" professionalism (appraisal, standards and CPD); and a redefinition of professional knowledge. Through these policies, the Government hoped to harness teacher professionalism to their broader reform agenda. The paper concludes with a discussion of Tony Blair's legacy in this field both in England and internationally.