Jan Koum is an American internet entrepreneur with an estimated net worth of $11.3 billion as of April 2019. He is best recognized as the co-founder and chief executive officer of the mobile messaging application "WhatsApp". In February 2014, the application was acquired by Facebook for $19 billion.

Jan Koum was born on February 24, 1976, in Kiev Ukraine. While studying at the San Jose State University, Koum was working as a security tester for Ernst & Young. Eventually, he was hired by Yahoo where he spent the next 9 years of his life.

In 2009, he created the application which enabled users from all over the world to send messages from their mobile phones for free. Today, the application is considered as the largest mobile messaging service provider with total active users of over 430 million.

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