He was born in Polzela (German: Heilenstein), near Celje, Slovenia, then part of the Austro-Hungarian Empire, into a family of assimilated Jews.
At the end of World War II, the two travelled to the liberated zone in south-east Yugoslavia, where they volunteered as physicians in the units of the partisan resistance.
Parin, along with Fritz Morgenthaler and Goldy Parin-Matthèy, co-founded the Zurich School of Ethnopsychoanalysis in the 1950s.
Additionally, contributions were made by researchers including Mario Erdheim, Maya Nadig, Florence Weiss, and Jochen Bonz.
[3] In 1992, Parin received the prestigious Erich Fried Prize for his literary achievements.