The photo is a cropped version of the original, which is Order Number B015753 in the National Library of Medicine. The date and author (below) are taken from the NLM's MARC record. The photograph was published in 1955 without a copyright notice.
This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
== Summary == {{Information |Description= Leo Kanner, circa 1955. |Source= This copy was retrieved from the History of Autism (Geschichte autistischer Störungen) web page, which is now moved; the [http://www.uni-marburg.de/fb20/kjp/forschung/aut/ass/ges