The article presents data from a study of the effectiveness of advanced training courses for teachers of organizations of primary, basic secondary and general secondary education in Almaty, engineering and teaching staff of colleges and faculty of organizations of higher and postgraduate education of the Almaty region, carrying out teacher training. Taking into account the results of international OECD research on professional development of teachers and administrative and managerial staff of schools, we developed questionnaires for faculty members and prepared survey materials for staff of colleges and providers of professional development services. A survey of teaching staff and teachers in Almaty was carried out. Interviews were conducted with college employees and employees of the leading providers of professional development of the IPR and the faculty of the Ministry of Education and Science of the Republic of Kazakhstan: Centre for Teaching Excellence of Joint Stock Company «Nazarbayev Intellectual Schools» («Center of excellence»), Joint Stock Company «National Professional Development Center «Orleu» («Orleu»), Non-profit Joint Stock Company «Talap» («Talap»). The conclusions of the study are summarized and presented. Based on the study of international experience and analysis of the effectiveness of professional development of teachers and faculty, recommendations for the improvement of educational programs of professional development of teachers have been developed.