He started his research career applying fairly deep mathematical ideas to gain insight into how complex physical and engineering systems work. His work was theoretical and somewhat abstract. Since then, his research has evolved toward studying a different type of complex system: how students learn and become excited about engineering. In this endeavor, Dr. Coller is mostly a “nuts & bolts” practitioner, an engineer, and an experimentalist. Specifically, he creates video games. To succeed in the games, players (students) have to solve authentic and engineering problems. Like any good game, the level of challenge increases as players’ skills improve. One may see an example at http://www.youtube.com/watch?v=LYGwaI-haOM