Dart's closest ally was Robert Broom whose discoveries of further "Australopithecines" (as well as Wilfrid Le Gros Clark's support) eventually vindicated Dart, so much so that in 1947 Sir Arthur Keith said "...Dart was right, and I was wrong". Keith made this statement referring to his dismissal and skepticism of Dart's analysis of the 'Taung Child' as an early human ancestor; Keith thought that it was more likely to be an ape, yet later research by Broom confirmed Dart's theories. Dart's theories were also popularized by playwright, screenwriter, and science writer Robert Ardrey, first in an article published in "The Reporter" and reprinted in "Science Digest", and later in Ardrey's influential four-book Nature of Man Series, which began in 1961 with "African Genesis".