Jack Dorsey： Facts About The CEO Of Twitter And Square ｜ CNBC

Jack Dorsey has become one of the most influential techology entrepreneurs in the world, joining the ranks of Steve Jobs and Elon Musk. He boasts the unique distinction of running not just one but two major companies, Square and Twitter. The dual role has earned Dorsey a net worth more than $4 billion, according to Forbes.

The 41-year-old is best-known for co-founding Twitter in 2006, but his tenure there hasn't exactly been smooth. In 2008, Dorsey was fired from the social media network he helped invent, before returning as its chief seven years later.

The company went through some growing pains in his absence. Upon Dorsey's return in 2015, Twitter's stock had been steadily trending downward, but the tide has started to turn. Shares have jumped more than 30 percent this year.

Then there's Dorsey's lesser-known but still prominent and rapidly expanding mobile payments company, Square. In fact, it has been growing even faster than rival PayPal, according to Nomura Instinet. Since early 2016, Square Cash app downloads have averaged 128 percent year-over-year growth each month versus Venmo's 74 percent. Venmo is a unit of PayPal.