Pythagoras isn't considered to be the founder of any movement.
Pythagoras of Samos ( [ pɪˈθægərəs ] [ paɪˈθægərəs ] [ Πυθαγόρας ὁ Σάμιος , Pythagóras ho Sámios , Pythagoras the Samos , Samian ] , or simply Πυθαγόρας Πυθαγόρης in Ionian Greek ; ) was an Ionian Greek philosopher , mathematician , and putative founder of the Pythagoreanism movement .