Masters of Doom, by David Kushner, tells the story of the two Johns - John Romero and John Carmack; and how they created Doom and Quake - which revolutionised computer games, giving rise to the gaming culture as it exists today. I’m not a gamer. What, or who caught my interest was John Carmack - a legend in the field of technology and programming. Also, I love to read on how makers make.