Carl Rogers lived from 1902-1987. He was a humanistic psychologist who agreed largely with Abraham Maslow. He believed that anyone can achieve their goals and aspirations in life. When they achieve these goals, self actualization takes place. This was one of Rogers' largest contributions to the field of psychology. A quote by him was, "The good life is a process, not a state of being. It is a direction, not a destination."
The subject of self-actualization is very important because it surely helped, and continues to help people through tough and achieve goals. His theory surely changed many people for good. It added to humanism because it focused on a person focusing on her or himself, which is the entire point of humanism. The thought of humanistic psychology was not as popular as some others, but he brought it up to be famous during and after his life.