After grad school I went to work for the game developer Harmonix (which was then a small, independent game developer) on a then small project. It was a really exciting ride to watch this project become the very first game in the now rock-start status franchise Guitar Hero.
My contribution on Guitar Hero 1 was to help author the levels of the game, provide general game design input, and polish the gameplay of the multi-player mode, which required tuning the difficulty levels and in-game details.
While working at Harmonix I also prototyped several new music game concepts, looking for ways to expand music-driven gameplay into new areas, including other game genres like action and platform. Some of the concepts I worked on eventually turned into a game called Phase for the iPod.