A description of the author's collaboration with Albert Einstein in Princeton, and his journey from the ghetto in Cracow, Poland, to the universities in Lwow, Cambridge, Princeton and Toronto. Leopold Infeld was not only a scientist, but a fighter for world peace who was against his will forced to join the Austro-Hungarian army during the First World War. He was also a loving husband and father, and a tireless promoter of young physicists starting up on their own scientific quests in post-war Poland.