I am greedy. But most people misunderstand greed. Greed is a powerful driving force. Throughout history, mankind's greatest achievements were driven by men that wanted to better their positions. Driven by greed. Greed, for lack of a better word, is good.
He is described as very nicely dressed with his hair slicked back. He describes himself as greedy, although he adds that most people misunderstand greed, which is a powerful driving force. Gordon is a member of the Brain's Renewalcult and he has calculated that if the Gecko reactor was running properly, we could generate an enormous amount of excess power - far more than Gecko needs.
Gordon "of Gecko" is clearly based on and a reference to the character of Gordon Gekko (played by Michael Douglas) from the film Wall Street, complete with his ideals of personal greed, style of dress, and "greed is good" monologue.