George Dantzig was a mathematician who changed the way people solve problems. He developed a method called "linear programming" which helps people find the best solution to solve certain problems. For example, if you wanted to make a certain amount of money, linear programming would help you figure out the quickest and best way to do it. He also worked on famous problems like the "traveling salesman problem" which is often used in computers today. His work has helped many people solve difficult problems more easily.