Note: I graduated in August 2012 and have since moved on to JHU/APL. This page is here for archival purposes.

Address: 4431 A.V. Williams Building
University of Maryland
College Park, MD 20742 USA
Phone: +1-301-405-1769
Email:

Greetings! I graduated with a PhD from the Institute for Advanced Computer Studies of the Computer Science department at the University of Maryland, College Park. My advisor is Prof. Hanan Samet. I also have an MS degree in Computer Science and a BS in Computer Engineering, both from the University of Maryland.

Main Research Projects

My research focus has been on developing new algorithms and methods for performing geotagging of text documents. This problem consists of finding all textual references to geographic locations in natural language text, and resolving them by assigning lat/long values to each such reference. Geotagging's difficulty lies in distinguishing non-locations from locations (Paris, France vs. Paris Hilton) and between interpretations of location names (Paris, France vs. Paris, Texas), tasks which are relatively easy for humans, but difficult for computers. This work touches on many research areas including information extraction, named-entity recognition, text mining, machine learning, data mining, and others.

Also, in collaboration with the other members of my research group, I've been involved in the development and maintenance of several working systems that leverage my algorithms to perform geotagging on large collections of documents. These fully-automated systems, named STEWARD, NewsStand, and TwitterStand, use my geotagging algorithms to find location references in hidden Web documents, streaming news articles, and streaming tweets, respectively. They feature highly modular and scalable architectures, and perform a variety of additional processing in addition to geotagging, including document clustering, image understanding, topic classification, entity recognition, and others. They also enable spatio-textual querying of documents through extensive and featureful Web and mobile interfaces.

Publications

  1. M. D. Lieberman and H. Samet. Supporting rapid processing and interactive map-based exploration of streaming news. In GIS'12: Proceedings of the 20th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems, Redondo Beach, CA, November 2012. To appear.
  2. M. D. Lieberman and H. Samet. Adaptive context features for toponym resolution in streaming news. In SIGIR'12: Proceedings of the 35th International ACM SIGIR Conference on Research and Development in Information Retrieval, pages 731–740, Portland, OR, August 2012. (acceptance rate 20.2%) [pdf]
  3. H. Samet, M. D. Adelfio, B. C. Fruin, M. D. Lieberman, and B. E. Teitler. Porting a web-based mapping application to a smartphone app. In GIS'11: Proceedings of the 19th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems, pages 525–528, Chicago, November 2011. Best demo award. [pdf]
  4. J. L. Leidner and M. D. Lieberman. Detecting geographical references in the form of place names and associated spatial natural language. SIGSPATIAL Special, 3(2):5–11, July 2011. [pdf]
  5. M. D. Lieberman and H. Samet. Multifaceted toponym recognition for streaming news. In SIGIR'11: Proceedings of the 34th International ACM SIGIR Conference on Research and Development in Information Retrieval, pages 843–852, Beijing, China, July 2011. (acceptance rate 19.8%) [pdf]
  6. H. Samet, B. E. Teitler, M. D. Adelfio, and M. D. Lieberman. Adapting a map query interface for a gesturing touch screen interface. In WWW'11: Proceedings of the 20th International World Wide Web Conference, pages 257–260, Hyderabad, India, March 2011. [pdf]
  7. M. D. Lieberman, S. Taheri, H. Guo, F. Mirrashed, I. Yahav, A. Aris, and B. Shneiderman. Visual exploration across biomedical databases. TCBB: IEEE/ACM Transactions on Computational Biology and Bioinformatics, 8(2):536–550, March 2011. [pdf]
  8. G. Quercini, H. Samet, J. Sankaranarayanan, and M. D. Lieberman. Determining the spatial reader scopes of news sources using local lexicons. In GIS'10: Proceedings of the 18th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems, pages 43–52, San Jose, CA, November 2010. (acceptance rate 20.9%) [pdf]
  9. M. D. Adelfio, M. D. Lieberman, H. Samet, and K. A. Firozvi. Ontuition: Intuitive data exploration via ontology navigation. In GIS'10: Proceedings of the 18th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems, pages 540–541, San Jose, CA, November 2010. [pdf]
  10. M. D. Lieberman, H. Samet, and J. Sankaranarayanan. Geotagging with local lexicons to build indexes for textually-specified spatial data. In ICDE'10: Proceedings of the 26th International Conference on Data Engineering, pages 201–212, Long Beach, CA, March 2010. (acceptance rate 12.5%) [pdf]
  11. M. D. Lieberman, H. Samet, and J. Sankaranarayanan. Geotagging: Using proximity, sibling, and prominence clues to understand comma groups. In GIR'10: Proceedings of the 6th Workshop on Geographic Information Retrieval, Zurich, Switzerland, February 2010. [pdf]
  12. J. Sankaranarayanan, H. Samet, B. Teitler, M. D. Lieberman, and J. Sperling. TwitterStand: News in tweets. In GIS'09: Proceedings of the 17th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems, pages 42–51, Seattle, WA, November 2009. (acceptance rate 20.5%) [pdf]
  13. M. D. Lieberman, H. Samet, J. Sankaranarayanan, and J. Sperling. Spatio-textual spreadsheets: Geotagging via spatial coherence. In GIS'09: Proceedings of the 17th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems, pages 524–527, Seattle, WA, November 2009. [pdf]
  14. M. D. Lieberman and J. Lin. You are where you edit: Locating Wikipedia users through edit histories. In ICWSM'09: Proceedings of the 3rd International AAAI Conference on Weblogs and Social Media, pages 106–113, San Jose, CA, May 2009. (acceptance rate 17.4%) [pdf]
  15. B. E. Teitler, M. D. Lieberman, D. Panozzo, J. Sankaranarayanan, H. Samet, and J. Sperling. NewsStand: A new view on news. In GIS'08: Proceedings of the 16th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems, pages 144–153, Irvine, CA, November 2008. Best paper award. (acceptance rate 19.7%) [pdf]
  16. M. D. Lieberman, J. Sankaranarayanan, H. Samet, and J. Sperling. Augmenting spatio-textual search with an infectious disease ontology. In IIMAS'08: Proceedings of the Workshop on Information Integration Methods, Architectures, and Systems, pages 266–269, Cancun, Mexico, April 2008. [pdf]
  17. M. D. Lieberman, J. Sankaranarayanan, and H. Samet. A fast similarity join algorithm using graphics processing units. In ICDE'08: Proceedings of the 24th International Conference on Data Engineering, pages 1111–1120, Cancun, Mexico, April 2008. (acceptance rate 12.2%) [pdf]
  18. M. D. Lieberman, H. Samet, J. Sankaranarayanan, and J. Sperling. STEWARD: Architecture of a spatio-textual search engine. In GIS'07: Proceedings of the 15th ACM International Symposium on Geographic Information Systems, pages 186–193, Seattle, WA, November 2007. (acceptance rate 28.7%) [pdf]
  19. H. Samet, M. D. Lieberman, J. Sankaranarayanan, and J. Sperling. STEWARD: Demo of spatio-textual extraction on the web aiding the retrieval of documents. In DG.O'07: Proceedings of the 8th Annual International Conference on Digital Government Research, Bridging Disciplines & Domains, pages 300–301, Philadelphia, PA, May 2007. [pdf]

Teaching Experience

  • Graduate Teaching Assistant for Data Structures (CMSC 420) and Geographical Information Systems and Spatial Databases (CMSC 725), 2006–present
  • Undergraduate Teaching Fellow for Programming Concepts for Engineering (ENEE 114), 2005
  • Volunteer Tutor, University of Maryland Honors Program, 2002–2004

Professional Service

  • Reviewer, International Journal of Geographical Information Science (IJGIS)
  • Reviewer, Distributed and Parallel Databases (DAPD) 2012 Special Issue on Ranking
  • GIR 2010 Program Committee
  • External reviewer, ACM SIGSPATIAL GIS 2010/2011, EG-IT 2010, SISAP 2009/2010

Selected Awards and Honors

  • ACM SIGSPATIAL GIS 2011 Best Demo Award for “Porting a web-based mapping application to a smartphone app”
  • UMD 2009 Invention of the Year Finalist for “TwitterStand: A Dynamic Aggregator for New Media”
  • ACM SIGSPATIAL GIS 2008 Best Paper Award for “NewsStand: A New View on News”
  • UMD Computer Science Dean’s Fellowship, 2008–2009
  • UMD Computer Science Graduate Fellowship, 2006–2008
  • NSF Research Experience for Undergraduate, 2005
  • A. James Clark School of Engineering Dean’s Scholarship, 2002–2003

Other Interests

I play quite a bit of squash. See my squash page.