Katharine Cook Briggs was an American writer who was the co-creator, with her daughter Isabel Briggs Myers, of an inventory of a widely popular personality type system known as the Myers–Briggs Type Indicator (MBTI).
Briggs in the early 20th century
Cook (left) with her daughter Isabel in an early 20th century photograph
Isabel Briggs Myers was an American writer who co-created the Myers–Briggs Type Indicator (MBTI) with her mother, Katharine Cook Briggs. The MBTI is one of the most-often used personality tests worldwide; over two million people complete the questionnaire each year. Isabel Briggs Myers typed herself as an INFP (Mediator)
Myers in the early 20th century