This 1931 astrology magazine with horoscopes by "Wynn" featured a 2-page spread on Joan (see below). A modern-day Wynn bio from www.astro.com:

American astrologer who went from cartoonist to writer of bad verse to astrologer in 1914. He wrote a Sun-sign column for the New York Daily News and published "Wynn's Astrology Magazine." Dissatisfied with the results he got from progressions and directions, he developed a forecasting method based on the Solar Return chart which he wrote about in his book, "The Key Cycle."