Musk — the world's richest person, according to the Bloomberg Billionaires Index — moved his private foundation to Austin in December. Zachary Kirkhorn, Tesla's CFO, recently bought a house in the city, and Tesla has datelined each of its last two press releases from Austin. Musk moved to Texas last year to focus on two big priorities for his companies: SpaceX's new Starship vehicle, under development on the Gulf Coast near Brownsville, and Tesla's still-under-construction factory in Austin. Texas is Tesla's third-biggest market in the US, behind only California and Florida, despite years of opposition from auto dealers to its direct sales model. The state has no personal income tax, whereas California imposes the highest personal income levies in the nation on its wealthiest residents.