See how different Elon Musk, Jeff Bezos, and other tech CEOs looked when they first started their companies

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• Some of Silicon Valley's biggest names are in their tech bro era.
• It wasn't always like this — many Big Tech CEOs have shed more nerdy personas from their startup days.
• Here's a look at tech's most influential executives then and now.

Mark Zuckerberg isn't the only tech CEO whose style has noticeably evolved over the years.