[jtmarmon]

My guess is square. The CFO went to stanford for an MBA, where the author taught.

Neither CFO Tesla has had went to Stanford.

Can't find anything about Dorsey working at one of the startups listed on the author's wikipedia page, but he seemed to have been involved with many so it would be unsurprising if it just wasn't listed there.

[Denzel]

Musk worked at Rocket Science Games, a Steve Blank startup, almost two decades ago.

[blackguardx]

I worked at Square on the hardware team. Sarah Friar (CFO) and Jack Dorsey (CEO) aren't like that and Square doesn't do any manufacturing. They use contract manufacturers.

[tdeck]

Square was never located in Palo Alto (although there is/was a small South Bay office where people could work one day a week) and is not, as far as I know, moving to the East Bay.