Martin Seligman is an American psychologist best known for his work in the field of positive psychology. He has focused on understanding what makes life fulfilling and how people can cultivate happiness. Seligman believes that instead of just treating mental illness, psychology should also promote well-being and personal strengths. Seligman developed the concept of the PERMA model, which stands for Positive Emotion, Engagement, Relationships, Meaning, and Accomplishment. This framework helps individuals identify areas in their lives that can enhance their overall happiness. His research has influenced various fields, including education, therapy, and even business, making a significant impact on how we understand human potential.