Jack Dorsey

Block Head and CEO, Block, Inc.

Jack Dorsey is the co-founder of Block, Inc., which owns Square and Cash App, and holds the title of Block Head. He co-founded Twitter and served as its CEO in 2007 and 2008 and again from 2015 to 2021, co-founded Square with Jim McKelvey, and was named as an investor in Mercor's 2024 Series A.