Google Co-founder Sergey Brin, who turned 43 on Sunday, is the world's 13th richest person with a net worth of $37.9 billion. The Moscow-born entrepreneur stands 6th on Forbes' '100 Richest Tech Billionaires In The World In 2016' list. Brin is presently serving as the President of Alphabet, Google's parent company and runs its secretive X division.