![These successful men are also insomniacs These successful men are also insomniacs](http://www.saharasamay.com/pics/article/2015_12_19_11_45_05_Insomniacs-5.jpg)
Photo of Jack Dorsey is an American programmer and entrepreneur widely known as a co-founder and CEO of Twitter, and as the founder and CEO of Square, a mobile payments company.
Photo of Jack Dorsey is an American programmer and entrepreneur widely known as a co-founder and CEO of Twitter, and as the founder and CEO of Square, a mobile payments company.