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 Expert  727236

Expert in Forensic Linguistics, Authorship Analysis, Data Mining, Artificial Intelligence

Available for your Consulting and Expert Witness Needs

Illinois (IL)
Education Work History Career AccomplishmentsPublicationsConsulting Services Expert Witness

Summary of Expertise:

Listed with other top experts in: 

Expert is an expert in the use of computers to identify document authorship by linguistic analysis. This includes such tasks as determining if a document has been plagiarized, identifying whether a given individual was the author of an anonymous document (authorship attribution), and identifying characteristics of a document's author (their sex, age, likely educational background, personality, etc.). The methods he has developed are applicable to civil investigations in areas such as copyright and intellectual property, as well as for criminal investigations where author authentication or attribution is needed to find or incriminate a suspect.

Expert's published research includes several influential results in this area. His work on determining author gender from writing style was the first to show clear differences between male and female writing in both formal and informal genres, and across multiple languages and time-periods. He has shown how certain aspects of personality are reliably indicated by certain patterns of word usage, obtaining more accurate results than competing approaches. A primary contribution of his research on stylistic text analysis, is a novel methodology for constructing meaningful features for authorship analysis (based on functional/semantic principles) which give better results than previous methods in many cases.

Expert's research has also been instrumental in working to solidify the methodological bases of the fields of automated authorship attribution and computational linguistics, which heretofore were plagued by methodological inconsistencies and low standards of reproducibility. He was the first to give a clear theoretical explanation of the popular "Delta" method for authorship attribution, thus enabling better analysis of its reliability in different circumstances. He was the principal investigator of an NSF-funded project to solidify the methodological bases of the field of automated authorship attribution, and is currently co-PI of the NSF-funded followup effort to create a standardized corpus for research in the area.

Expert has over 20 years of research experience in diverse areas of artificial intelligence and machine learning. His published research includes work on active learning, ensemble learning, learning with prior knowledge, robotic navigation, visual place recognition, shallow parsing, sentiment analysis, computational stylistics, and authorship attribution.

Expert has published numerous papers in many areas of natural language processing and computational linguistics, including shallow parsing, sentiment analysis, computational stylistics, genre analysis, text classification, part-of-speech tagging, information extraction, information retrieval, morphological analysis and rhetorical analysis. He has consulted to industry on projects in legal document processing, information retrieval, and business intelligence.






forensic document examination


artificial intelligence


learning machine


semantic analysis


natural language text processing


computational linguistics

Show Secondary and Basic Areas of Expertise
Expert may consult nationally and internationally, and is also local to the following cities: Chicago, Illinois;  Rockford, Illinois;  Aurora, Illinois;  Naperville, Illinois;  Joliet, Illinois;  Elgin, Illinois;  South Bend, Indiana;  Gary, Indiana;  Milwaukee, Wisconsin;  and Kenosha, Wisconsin.

Year   Degree   Subject   Institution  
1994   PhD   Computer Science   Yale University  
1991   MPhil   Computer Science   Yale University  
1988   BS   Applied Mathematics   Carnegie-Mellon University  

Work History:
Years   Employer   Department   Title  

2002 to




Computer Science


Associate Professor


1999 to 2002


Jerusalem College of Technology


Computer Science


Assistant Professor


1996 to 1999


Bar-Ilan University


Mathematics and Computer Science


Research Scientist


1994 to 1996


Bar-Ilan University


Mathematics and Computer Scientists


Fulbright Postdoctoral Research Fellow


1988 to 1994


Yale University


Computer Science


Graduate Research Assistant


1985 to 1988


Carnegie Mellon University


Computer Science


Research Programmer


Career Accomplishments:

Association for Computing Machinery (ACM), International Association of Forensic Linguists (IAFL), International Language and Law Association (ILLA)


Fulbright Postdoctoral Fellow

Publications and Patents Summary

He has 79 peer-reviewed publications and many others, and one patent. He is the editor of two current books: Computational Methods for Counterterrorism (Springer, 2009), and The Structure of Style (Springer, 2009, forthcoming).

Selected Publications and Publishers  
 - Communications of the Association for Computing Machinery  
 - Text  
 - Journal of Experimental and Theoretical Artificial Intelligence  
 - International Association of Forensic Linguists  
 - Journal of the American Society for Information Sciences and Technology  

Consulting Services:
Selected Consulting Examples:
  • Expert consulted for AOL Research (2006), providing new algorithms and technology for development of a prototype system to predict emerging trends in web search. The system could predict in advance many of the most popular web searches for the following day, as well as give meaningful explanations for why people suddenly became interested in them.
  • Expert consulted for Radcom, Ltd. (1998-99) in Tel-Aviv, Israel, helping develop novel proprietary technology more more efficient analysis of Internet protocol traffic.
  • From 1995 to 1998, Expert had a long-term consulting arrangement with Expert-Ease Development, Inc., now part of Thomson Reuters. His primary contribution was the development of the patented text mining algorithms that form the core of the company's flagship product, Deal Proof (available from Thomson West). He also helped with the design and development of many other aspects of that product.
  • Expert consulted for Compassware Development, Inc. (1995-1997), an information retrieval software company in Jerusalem, Israel. He developed new methods for effective information retrieval, document clustering, and text mining, as part of the company's InfoMagnet enterprise content management system.
Recent Client Requests:
  • Expert in identification for consulting on who wrote an article.
Click the green button above to contact Expert for a free initial screening call regarding your expert consulting needs.  Expert is available for consulting to corporate, legal and government clients.  Remember, your initial screening call to speak with Expert is free.

Expert Witness:
Recent Litigation Client Requests:
  • Expert in computational linguistics and ESI for consulting on a class action lawsuit.
  • Expert for consulting on trademark survey accuracy litigation.
Click the green button above to contact Expert for a free initial screening call regarding expert testimony, litigation consulting and support, forensic services, or any related expert witness services.  A few litigation needs include product liability, personal injury, economic loss, intellectual property (patent, trademark, trade secret, copyright), and insurance matters.  Remember, your initial screening call to speak with Expert is free.

International Experience:
Years   Country / Region   Summary
1994 to 2002   Israel   Expert lived and worked primarily in Israel from 1994 to 2002, in academic research and teaching positions as well as for a variety of consulting clients.

Language Skills:
Foreign Language   Description
Hebrew   Expert speaks and reads Hebrew fluently as a non-native, and writes Hebrew with good facility.
Arabic   Expert is familiar with the principles of Arabic grammar and orthography, and has published research on computational analysis of the language.


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