In 2001, James Hendler joined Web inventor Tim Berners-Lee and their colleague Ora Lassila in writing an article describing a vision for the Semantic Web. The paper, which appeared in Scientific American, has been widely cited and led to much work in both academia and industry aimed at adding machine-readable text to the Web. Now, nearly 20 years later, Google reports that machine-readable metadata is found on over 40% of their crawl and knowledge graph technology, which also grew from this vision, is now a big business used by major organizations around the world. Also growing out of that vision has been the use of linked data in many applications particularly including collection management in libraries, museums and video archiving applications. However, despite this success, much of the original vision of the Semantic Web remains unrealized. In this talk, he discusses what was in the original vision, what has occurred and, most importantly, what still remains to be done if we are truly to recognize the full potential of the Semantic Web.