Sigmund Freud, Stanley Hall, Carl Gustav Jung, Abraham Arden Brill, Ernest Jones and Sándor Ferenczi. Photograph, 1909. https://www.rawpixel.com/image/13991591/photo-image-face-person-clothingFree Image from public domain licenseRichard Norris Wolfenden. Albumen print by G. Chaplin Jones. https://www.rawpixel.com/image/14022054/richard-norris-wolfenden-albumen-print-chaplin-jonesFree Image from public domain license