Slim, the "prince of the ranch," is the master “skinner” or mule driver of the ranch. He is a tall man with "god-like eyes" and long black hair. In fact, he is so tall and confident that he does not wear high-heeled boots like most of the farm hands. He is also described as moving majestically and royally, so he is an elegant man despite the fact that he works on a ranch.
Slim is the best at his trade and can ethically influence the other men since they all respect him and his opinion. "His ear heard more than was said to him, and his slow speech had overtones not of thought, but of understanding beyond thought," which means he is a man of few words, serious, and insightful, and people, such as George, often confide in him.