Allen Institute for AI
A photo of Peter Clark

Peter Clark

Research

Peter Clark is the Senior Research Manager for AI2. His work focuses upon natural language processing, machine reasoning, and large knowledge bases, and the interplay between these three areas. He has received several awards including a AAAI Best Paper (1997), Boeing Associate Technical Fellowship (2004), and AAAI Senior Member (2014). He received his Ph.D. in Computer Science in 1991, and has researched these topics for 30 years with more than 80 refereed publications.

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Software

  • KM: The Knowledge Machine

    KM is a powerful, frame-based language with clear first-order logic semantics. It contains sophisticated machinery for reasoning, including selection by description, unification, classification, and reasoning about actions using a situations mechanism. Its origins were the Theo language and the (now obsolete) language KRL. It is implemented in Lisp.

  • The DART Database

    The DART (Discovery and Aggregation of Relations in Text) database contains approximately 23 million distinct "world knowledge" propositions (110 million with duplicates), extracted from text by abstracting parse trees. The extraction system (DART) is based on ideas by Len Schubert. The DART system and database is described in detail in the paper below. The database was generated from the Reuters and BNC corpora. The database was created by Peter Clark and Phil Harrison (Boeing Research and Technology) and is publically available under the GNU Lesser General Public Licence.