Dr. Frankl worked with both Leo Kanner and Hans Asperger. Incidentally, Kanner and Asperger coined terminologies for similarly described differences in behaviours around the same time. Some consider this a coincidence; others are not so convinced.
Dr. Baron-Cohen discusses the revelations from Steve Silberman's book, "Neurotribes", which brings to light the complicated history of the conceptualization of the autism spectrum.