BASI® (Body Art and Science International®) Pilates was founded by Rael Isacowitz  in 1989 and its headquarters are in Costa Mesa, California. It is established in over 40 countries all over the world and boasts more than 200 training studios and 40,000 certified teachers. 

It provides internationally recognised training, as well as from the Pilates Method Alliance, which is rooted in anatomy, physiology and scientific principles and the aesthetic quality of each movement. BASI Pilates preserves the classic repertoire and the essence of Joseph Pilates' philosophy, integrating it with contemporary experience and scientific knowledge. 

To get more details:
https://www.basipilates.com