Career
His research interests include investigating the value of formal descriptions of chaotic systems like the Web, particularly in the consensus-building process, and the Semantic Web. He is mentioned in Tim Berners-Lee"s book, Weaving the Web, where he is referred to as an expert in web technology, hypertext systems, and markup languages. He became involved with distributed hypertext systems and SGML in 1992.
With Tim Berners-Lee he was co-editor of the initial Internet Engineering Task Force"s draft specification for HyperText Markup Language. He was principal editor of the HyperText Markup Language 2.0 specification and co-created one of the early HyperText Markup Language validators.
He joined World Wide Web Consortium (W3C) in 1994 and chaired the W3C Working Group that produced HyperText Markup Language 3.2 and HyperText Markup Language 4.0. Together with Jon Bosak he formed the W3C eXtensible Markup Language Working Group that created the W3C eXtensible Markup Language 1.0 Recommendation.
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Dan chaired the first RDF Data Access Working Group, and served on the W3C Technical Architecture Group and the first Web Ontology Working Group. He was involved in the application of RDF in calendar software.
In June 2010, Dan left the W3C and took a position with University of Kansas School of Medicine as a Biomedical Informatics Software Engineer in their Department of Biostatistics.
As of March 2013, he still works there in that capacity.