Education
Experience
Published
Michael Schmidt, Brad Bebee, Willem Broekema, Mohamed Elzarei, Carlos Manuel Lopez Enriquez, Marcin Neyman, Florian Schmedding, Andreas Steigmiller, Bryan Thompson, Geo Varkey, Gregory Todd Williams and Amanda Xiang. (2024). openCypher over RDF: Connecting Two Worlds. Proceedings of the ISWC Poster and Demos Track, Baltimore, MD, November 11 2024. (Best Demo Award.)
Willem Broekema, Mohamed Elzarei, Ora Lassila, Carlos Manuel Lopez Enriquez, Marcin Neyman, Florian Schmedding, Michael Schmidt, Andreas Steigmiller, Geo Varkey, Gregory Todd Williams and Amanda Xiang. (2024). openCypher Queries over Combined RDF and LPG Data in Amazon Neptune. Proceedings of the ISWC Industry Track, Baltimore, MD, November 11 2024.
Olaf Hartig, Gregory Todd Williams, Michael Schmidt, Ora Lassila, Carlos Manuel Lopez Enriquez and Bryan Thompson. (2024). Datatypes for Lists and Maps in RDF Literals. Proceedings of the Extended Semantic Web Conference Poster and Demos Track, Hersonissos, Greece, May 26 2024. (Best Poster Award.)
Morari, A., Castellana, V. G., Villa, O., Weaver, J., Williams, G. T., Haglin, D. J., Tumeo, A. and Feo, J. (2015). GEMS: Graph Database Engine for Multithreaded Systems in K. Li, H. Jiang, L. T. Yang and A. Cuzzocrea (Eds.), Big Data: Algorithms, Analytics, and Applications (pp. 139–156). New York, NY: Chapman and Hall/CRC.
Gregory Todd Williams and Kjetil Kjernsmo. (2014). Pushing complexity down the stack. Proceedings of the ISWC Developers Workshop 2014, Riva del Garda, Italy, October 19 2014, online pdf.
Gregory Todd Williams. (2013). Planning and Evaluation of Federated Queries on the Web. Ph.D. thesis, Rensselaer Polytechnic Institute, Troy, New York, March 2013, online pdf.
Gregory Todd Williams and Jesse Weaver. (2011). Enabling fine-grained HTTP caching of SPARQL query results. Proceedings of the 10th International Conference on The Semantic Web (ISWC), Bonn, Germany, October 23 2011, online pdf.
Jesse Weaver and Gregory Todd Williams. (2011). Reducing I/O load in parallel RDF systems via data compression. Proceedings of the 1st Workshop on High-Performance Computing for the Semantic Web (HPCSW 2011), May 29 2011, online pdf.
Gregory T. Williams, Jesse Weaver, Medha Atre, and James A. Hendler. (2010). Scalable Reduction of Large Datasets to Interesting Subsets. Journal of Web Semantics: Science, Services and Agents on the World Wide Web, online.
Sibel Adali, Robert Escriva, Mark K. Goldberg, Mykola Hayvanovych, Malik Magdon-Ismail, Boleslaw K. Szymanski, William A. Wallace and Gregory T. Williams. (2010). Measuring Behavioral Trust in Social Networks. Proceedings of IEEE International Conference on Intelligence and Security Informatics (ISI 2010).
Gregory Todd Williams, Jesse Weaver, Medha Atre, and James A. Hendler. (2009). Scalable Reduction of Large Datasets to Interesting Subsets. Winner, Billion Triples Challenge, 8th International Semantic Web Conference, Chantilly, Virginia, October 27 2009, online pdf.
Jesse Weaver and Gregory Todd Williams. (2009). Scalable RDF query processing on clusters and supercomputers. Proceedings of the 5th International Workshop on Scalable Semantic Web Knowledge Base Systems (SSWS), Chantilly, Virginia, November 26 2009, 73-85, online pdf.
Gregory Todd Williams. (2008). Supporting Identity Reasoning in SPARQL Using Bloom Filters. Proceedings of Workshop on Advancing Reasoning on the Web, Tenerife, Spain, June 2 2008, online pdf.
Gregory Todd Williams. (2007). Extensible SPARQL Functions With Embedded Javascript. Proceedings of 3rd Workshop SFSW'07, Innsbruck, Austria, June 6 2007, online pdf.
Gregory Todd Williams. (2005). MT-Redland: An RDF Storage Backend for Movable Type. Proceedings of 1st Workshop SFSW'05, Hersonissos, Greece, May 30 2005, CEUR Workshop Proceedings, ISSN 1613-0073, online pdf.
Betsey D. Dyer, Mark D. LeBlanc, Stephen Benz, Peter Cahalan, Brian Donorfio, Patrick Sagui, Adam Villa and Gregory Williams (2004). A DNA motif lexicon: cataloguing and annotating sequences. In Silico Biology 4,0039(2004).
Gousie, M. B., Williams, G., Agnitti, T., and Doolittle, N. CompSurf: An Environment for Exploring Surface Reconstruction Methods on a Grid. Computers & Geosciences 29, 9(2003), 1165-1173.
Williams, G., Doolittle, N. and Agnitti, T. (2002). A surface reconstruction research environment. The Journal of Computing in Small Colleges,v17(6), 301–302. Presented at the 2002 Northeastern Conference on Computing in Small Colleges, Worcester, MA, April 2002.
LeBlanc, M., Baron, M., Christoforou, A., Doolittle, N., Kimball, M., Villa, A., Williams, G. and Dyer, B. (2002). The DNA Motif Lexicon — cataloguing and annotating genomes. Proceedings of the 14th International Genome Sequencing and Analysis Conference, October 2–5, 2002, Boston, MA, p.92.
Program Committees
- 2010, 2017–2020: International Semantic Web Conference (ISWC)
- 2013–2016, 2019–2020, 2022: European Semantic Web Conference (ESWC)
- 2010–2018: Linked Data on the Web (LDOW)
- 2012: Joint Workshop on Scalable and High-Performance Semantic Web Systems (SSWS+HPCSW)
- 2011: High-Performance Computing for the Semantic Web (HPCSW)
- 2010: Scripting for the Semantic Web (SFSW) (Program Chair)
- 2008–2010: Scripting for the Semantic Web (SFSW) (Program Chair, 2010)
Standards Groups
- 2009–2013: W3C SPARQL Working Group. Editor, SPARQL 1.1 Service Description, SPARQL 1.1 Protocol.
- 2020–: W3C RDF-star Working Group.
Projects
Designed and implemented a system as part of the data.gov project to convert open governmental data from tabular formats to RDF, allowing iterative enhancement of data including schema mapping and recording of maximal data provenance.
Designed and implemented the open source Kineo SPARQL system for Swift. Based on trait-based design and lessons learned in the Attean project, Kineo is a research platform for exploring new approaches to implementing and extending SPARQL.
Designed and implemented the Attean, RDF::Query, and , RDF::Trine RDF frameworks and query engines for Perl. RDF::Query was one of the initial 14 implementations of SPARQL as it was published as a W3C Recommendation in 2008, and was one of the first system to fully support the SPARQL 1.1 Query, Update, Service Description, and Protocol standards in 2013.