It’s no secret that there is money to be made in the tech industry. Every quarter brings with it another Silicon Valley darling with a billion dollar valuation. In recent years, some philanthropically minded techies have been doing their best to harness the energy of the tech sector to do some good. Though we often think of technology as a way to make our lives easier, tech also has the power to make lives better.

The charitable opportunities in the tech space have attracted a number of celebrities to overhaul their philanthropic efforts for the 21st century. Actors, producers, musicians, and, of course, tech celebrities have turned to Silicon Valley and beyond in hopes of changing the world. And some have already made a meaningful impact, harnessing tech’s immense power to change things for the better. Here are 10 Stars Working With Tech Companies to Save the World.