[jives]

He's split his time between these two companies before. "... after 8 hours at Twitter, he literally walks 2 blocks to put in another 8 hour shift at Square."

http://thenextweb.com/entrepreneur/2011/11/14/jack-dorsey-do...

[jusben1369]

They were much smaller companies (pre public) in 2011 and he was never CEO at both at the same time. Executive Chairman is substantially different.