Isabel Briggs Myers was an American author and psychologist, best known for developing the Myers-Briggs Type Indicator (MBTI), a personality assessment tool. Born on April 18, 1897, she collaborated with her mother, Katharine Cook Briggs, to create the MBTI during World War II, aiming to help people understand themselves and others better. The MBTI categorizes individuals into 16 distinct personality types based on four dichotomies: Introversion vs. Extraversion, Sensing vs. Intuition, Thinking vs. Feeling, and Judging vs. Perceiving. Isabel's work has had a lasting impact on psychology, education, and career counseling, promoting personal growth and improved communication.