Copyrighted 1947, copyright not renewed. Einstein's estate may still claim copyright on this image, but any such claim would be considered illegitimate by the Library of Congress. No known restrictions.[1]
This image has been assessed under the valued image criteria and is considered the most valued image on Commons within the scope Albert Einstein. See its nomination here. This is a featured picture on the Arabic language Wikipedia (صور مختارة) and is considered one of the finest images. See its nomination here. This is a featured picture on the Persian language Wikipedia (نگارههای برگزیده) and is considered one of the finest images. See its nomination here.
If you think this file should be featured on Wikimedia Commons as well, feel free to nominate it.
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This image has been assessed under the valued image criteria and is considered the most valued image on Commons within the scope: Albert Einstein. You can see its nomination here.
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 (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.