Jolande Jacobi was a renowned Swiss psychologist and a prominent advocate of Carl Jung's analytical psychology. Born in 1890, she played a crucial role in popularizing Jung's theories through her writings and teachings. Jacobi authored several influential works, including "The Psychology of C.G. Jung," which served as an accessible introduction to Jungian concepts. Her contributions significantly shaped the understanding and application of Jungian psychology in the 20th century.