Clark Moustakas was a psychologist and author who developed the idea of “humanistic psychology”. Humanistic psychology is a type of psychology that focuses on the potential of individuals to reach their highest level of personal development, it also looks at how everyone's life experiences shape who they are. Clark Moustakas believed that everyone has the ability to reach self-actualization (being their best selves) when they have their needs met and they understand their true potential. He also wrote books and articles about the ideas of humanistic psychology and how it can help people reach their full potential.