History of Quake
From Quake Wiki
Quake was the first true-3D first person shooter, released in 1996. Previous first person shooter games (such as Doom, Duke3D, etc.) were considered to be fake-3D first person shooters.
John Romero was the director, and lead designer of Quake.
John Carmack was the lead programmer.
The engine was built well, and considered to be one of the most solid engines to date. It's completely configurable and moddable. In fact, Valve used the Quake engine for their first Half-life game/release.