What Dave did

Editor of 2 W3C W3C RDF Core WG standards - RDF/XML Revised, RDF Test Cases
Scalability and Storage workshop
Redland - RDF API (C, Perl, Python, C#, Ruby, Java, PHP, Tcl)
Raptor RDF Parser Toolkit (C)
Rasqal RDF Query Library (C)
SKOS Thesaurus Activity
DREFT Thesaurus demonstrations (Java)
Created the Turtle Terse RDF Triple Language and RXR
Worked on RDF Query in RDF Data Access WG - I named it SPARQL
Newflash: 1st SPARQL Query Language for RDF draft published Monday
... lots more ...