I am a Librarian and specialize in knowledge management, information visualization, data mining, etcetera.
My article is on Library Catalogs.
See also My contributions @ Wikipedia.
Categories of my interest are:
Information visualization, [Knowledge visualization], data visualization [Scientific visualization] Meta data [Data Mining] Community, Overview, and Directory Links Information Foraging Data Libraries [Books] [Glossary] Visual Mapping Visual Cue [Digital Libraries] Ontology