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10 facts about Jan Koum

10 things you did not know about WhatsApp founder Jan Koum

WhatsApp founder Jan Koum’s birthday is Monday, February 24 but Facebook could not wait till then to present him probably the biggest gift of his life. Here we list some of the lesser known details about the newest billionaire. Check the slideshow to find out more about Jan Koum. Koum once worked as a grocery store janitor in Mountain View, California to make ends meet. Koum and his mother stuffed their suitcases with pens and Soviet-issued notebooks to save money on school supplies in the US. His father never made it to America.