A shekara ta 1937, Popper ya sami matsayi wanda ya ba shi damar yin hijira zuwa New Zealand, inda ya zama mai koyar da falsafar a Kwalejin Jami'ar Canterbury na Jami'ar New Zealand a Christchurch. A nan ne ya rubuta aikinsa mai tasiri The Open Society and Its Enemies. A Dunedin ya sadu da Farfesa na Physiology John Carew Eccles kuma ya kulla abota da shi. A shekara ta 1946, bayan yakin duniya na biyu, ya koma Birtaniya don ya zama mai karatu a hankali da kuma hanyar kimiyya a Makarantar Tattalin Arziki ta London.
mai koyar da falsafa