Answer:

John Cowie.

A England-raised businessman who started a plastics manufacturing business in Hong Kong after the war. It was Cowie that started manufacturing a plastic version of the Japanese wooden sandals in the late 1940s. New Zealander Morris Yock imported from John Cowie and Co. and claimed the concept as his own which he patented in 1957. John Cowies children say that their father claimed to have invented the name Jandal from a shortened form of ‘Japanese Sandal’. John Cowie and family emigrated to New Zealand in 1959.