Katharine Cook Briggs was an American author and psychologist, best known for her work in personality theory. She co-developed the Myers-Briggs Type Indicator (MBTI) alongside her daughter, Isabel Briggs Myers. This tool categorizes individuals into 16 distinct personality types based on their preferences in four dichotomies: extraversion vs. introversion, sensing vs. intuition, thinking vs. feeling, and judging vs. perceiving. Briggs was born on January 3, 1875, in the United States and had a keen interest in understanding human behavior. Her research and writings have had a lasting impact on psychology, education, and career counseling, making her a significant figure in the field of personality assessment.