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Stephen Robertson is a British computer scientist. He is known for his work on probabilistic information retrieval together with Karen Spärck Jones and the Okapi BM25 weighting model.

Early life

Robertson was born in London, England, to (Theodosia) Cecil, née Spring Rice (1921–1984) and Martin Robertson (1911–2004), an internationally distinguished professor of Classical Greek Art and Archaeology at the University of London, Oxford University, and Trinity College, Cambridge. His younger brother is composer and musician Thomas Dolby.

Career

Okapi BM25 is very successful in experimental search evaluations and found its way in many information retrieval systems and products, including open source search systems like Lucene, Lemur, Xapian, and Terrier. BM25 is used as one of the most important signals in large web search engines, certainly in Microsoft Bing, and probably in other web search engines too. BM25 is also used in various other Microsoft products such as Microsoft SharePoint and SQL Server.

After completing his undergraduate degree in mathematics at Cambridge University, he took an MS at City University, and then worked for ASLIB. He earned his PhD at University College London in 1976 under the renowned statistician and scholar B. C. Brookes. He then returned to City University working there from 1978 until 1998 in the Department of Information Science, continuing as a part-time professor and subsequently as professor emeritus. He is also a fellow of Girton College, Cambridge University. Now retired, Robertson is Professor Emeritus at City University, and a visiting professor in the Department of Computer Science at UCL.

References

1. Robertson, S. E.; Spärck Jones, K. (1976). "Relevance weighting of search terms". Journal of the American Society for Information Science. 27 (3): 129. doi:10.1002/asi.4630270302.
2. Spärck Jones, K.; Walker, S.; Robertson, S. E. (2000). "A probabilistic model of information retrieval: Development and comparative experiments: Part 1". Information Processing & Management. 36 (6): 779–808. CiteSeerX 10.1.1.134.6108. doi:10.1016/S0306-4573(00)00015-7. S2CID 1965284.
3. Spärck Jones, K.; Walker, S.; Robertson, S. E. (2000). "A probabilistic model of information retrieval: Development and comparative experiments: Part 2". Information Processing & Management. 36 (6): 809–840. doi:10.1016/S0306-4573(00)00016-9.
4. Boardman, John (3 January 2008). "Robertson, (Charles) Martin (1911–2004), archaeologist and poet". Oxford Dictionary of National Biography. Vol. 1 (online ed.). Oxford University Press. doi:10.1093/ref:odnb/94618. (Subscription or UK public library membership required.)
5. Hiemstra, D.; Tait, J.; MacFarlane, A.; Belkin, N. J. (2013). "Celebrating Stephen Robertson's Retirement". BCS IRSG Informer.
6. Robertson, Stephen (December 2013). "Brief CV". Stephen Robertson, Information Science. Retrieved 19 November 2022.
7. "The Stephen Robertson Prize | UCL UCL Centre for Digital Humanities".

Publications

• Robertson, Stephen; Zaragoza, Hugo (2009). The Probabilistic Relevance Framework: BM25 and Beyond (PDF). NOW Publishers, Inc. ISBN 978-1-60198-308-4.
• Robertson, Stephen (2020). B C, Before Computers. Open Book Publishers. doi:10.11647/OBP.0225. ISBN 978-1-80064-029-0. S2CID 226361310.

• British computer scientists
• Alumni of University College London
• Fellows of Girton College, Cambridge
• Living people
• Alumni of City, University of London
• Academics of City, University of London
• Information retrieval researchers
• 1946 births