Cale Dunlap has been writing code in various languages since high school, when he wrote his first video game mod for Half-Life in 1999. In 2002, he contributed to the semi-popular Firearms mod for Half-Life and eventually helped bring that same video game mod to the Source Engine as Firearms—Source. He's earned an associate's degree in computer information systems and a bachelor's degree in game and simulation programming. He's worked professionally as a software developer for small companies since 2005, contributing to software ranging from web applications to military simulations. He currently works as a senior interactive developer for a creative agency based in Orange County, California, called Column Five.