Two of the world's most powerful CEOs, Elon Musk and Jeff Bezos, have been locked in a rivalry for the past 15 years.
While the two mainly feud over their respective space ambitions — Musk runs SpaceX, while Bezos launched Blue Origin — they also compete for talent, and Musk has taken public issue with Bezos on several occasions.
Musk called Bezos a copycat over some of Amazon's business ventures, said Amazon is a monopoly that should be broken up, and appeared to make digs about Bezos' age.
Over the last 15 years, two of the world's most high-profile CEOs, Elon Musk and Jeff Bezos, have been engaged in a simmering rivalry.
Here's how Musk's and Bezos' rivalry began and everything that's happened since.
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Elon, SpaceX, Twitter