Jan Koum
Jan Koum is a Ukrainian-born American businessman and computer programmer who co-founded the messaging application WhatsApp in 2009 with Brian Acton. He served as WhatsApp's CEO until leaving in 2018, following Facebook's 2014 acquisition of the company for approximately $19.3 billion. He later established the investment firm Newlands, and his net worth is estimated at around $16 billion.
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