The Rosen School in the UK runs a series of introductory workshops in Rosen Method, as well as the professional training programme in the UK. Its website includes some useful further information about Rosen Method.
The Rosen Institute is the organisation that certifies practitioners and oversees professional training programmes internationally. http://roseninstitute.net/
The Rosen Method International Journal is a free online journal providing current information, experience and research relating to Rosen Method.
The USA Rosen Method Practitioners Association is a professional organisation for Rosen Practitioners, and its website provides further information about Rosen Method.