I had very big difficulties choosing one person to describe which impress me the most as a leader. This guy is Ukrainian citizen who emigrated to the USA in early ‘90s. His life was quiet difficult without any life perspectives.
Jan Koum (born in Kiev, Ukraine on February 24, 1976) is an American internet entrepreneur and computer engineer. He is the CEO and co-founder with Brian Acton of WhatsApp, a mobile messaging application which was acquired byFacebook Inc. in February 2014 for US$19 Billion.
In 2014, he entered the Forbes list of the 400 richest Americans at position 62, with an estimated worth of more than seven and half billion dollars. He was the highest-ranked newcomer to the list that year.
He grew up in Fastiv, outside Kiev in Ukraine. In 1992 He moved with his mother and grandmother to Mountain View, California where a social support program helped the family to get a small two-bedroom apartment, at the age of 16. His father had intended to join the family later, but finally remained in Ukraine. At first Koum's mother worked as a babysitter, while he himself worked as a cleaner at a grocery. By the age of 18 he became interested in programming. He enrolled at San Jose State University and simultaneously worked at Ernst & Young as a security tester.
In 1997, Jan Koum was hired by Yahoo as an infrastructure engineer, shortly after he met Brian Acton while working at Ernst & Young as a security tester. Over the next nine years, they worked at Yahoo. In September 2007 Koum and Acton left Yahoo and took a year off, traveling around South America. Both applied, and failed, to work at Facebook. In January 2009, he bought an iPhone and realized that the then-seven-month-old App Store was about to spawn a whole new industry of apps. He visited his friend Alex Fishman and the two talked for hours about Koum’s idea for an app. Koum almost immediately chose the name WhatsApp because it sounded like “what’s