Aaron is the real deal - he's a professional beatboxer who's toured the world, and he's also a game developer. Currently, Aaron is working on a game called Robots in the Wild. He's made the game on his own, doing the coding, the art, the music, the voiceover-- all of it.
Grant Kirkhope is known for his music to games like Banjo-Kazooie, Viva Piñata and so many other great titles (seriously, listen to his music for Kingdoms of Amalur: Reckoning if you haven't). His newest tunes are in Sid Meier's Civilization: Beyond Earth, and the new expansion called Beyond Earth: Rising Tide.