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  • Stephen E Robertson
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Stephen E Robertson

Non-Stipendiary Fellow (Information Science)

Stephen Robertson (Non-stipendiary Fellow) is a researcher at the Microsoft Research Laboratory in Cambridge, UK. He retains a part-time professorship in the Department of Information Science which is part of the School of Informatics in the City University. He was full-time at City University from 1978 to 1998, and head of department from 1988 to 1996. He also started the Centre for Interactive Systems Research in the Department. His main research interests are in theories and models for information retrieval, specifically probabilistic models, the design and evaluation of IR systems, evaluation methods and optimization. Back in 1976, he was the author (with Karen Sparck Jones) of a probabilistic theory of relevance weighting, which has become quite well established in the field. An extension of that model (with Stephen Walker) led to the BM25 function for term weighting and document scoring, now used by many other research groups.

Prof. Robertson was awarded the Tony Kent Strix award in 1998 and the Gerard Salton award in 2000.