emily: square is not a public company. , everylic companies herter, to earnings calls, doesn't recommend steve jobs said it was deplorable. >> there is a difference between recommending and can it be successful. spacex is going to be a public company, worth $20 billion plus. it is going to succeed at this horrible job. steve was extremely successful at both companies. even if most would not want to thet, it doesn't mean that people who want to do it, who embrace the stress don't thrive at it. emily: do you think jack needs to hire a coo? >> no but the team you build is the company you build. to both companies have the right town or leadership, or the right energy. to have significant leaders in each functional unit. or yound a president don't have that cohesive team, historically in silicon valley you wouldn't want to have a president and coo. that is a crutch to -- emily: is it a crutch for him at twitter or facebook. >> it is an alternative structure but the preferable is to most of the advice have significant leaders in each functional unit. where it well is when the ceo wants to play