The tech billionaire’s staff were concerned that correspondence about his home in West Lake Hills would become public after neighbors complained.

Residents of an upscale enclave outside Austin, Texas, learned the hard way what it’s like when a multibillionaire moves into the mansion next door. Some...

That control is starting to fray as Mr. Johnson, a longevity guru known for performing experiments on his body, faces a backlash over the agreements.

SpaceX employees are working on plans for a Martian city, including dome habitats, spacesuits and researching whether humans can procreate off Earth. Mr. Musk has...

Ms. Shanahan, a lawyer who was married to Sergey Brin, a Google founder, led a rarefied and sometimes turbulent life in Silicon Valley, according to...