David S. Touretzky

David S. Touretzky books and biography


David S. Touretzky

David Touretzky
David Touretzky
United States
Residence United States
Nationality American
Field artificial intelligence, computational neuroscience
Institution Carnegie Mellon University
Alma Mater Rutgers University, B.A., 1978
Carnegie Mellon University, Ph.D., 1984
Notable Prizes Distinguished Scientist, Association for Computing Machinery, 2006

David S. Touretzky is a research professor in the Computer Science Department and the Center for the Neural Basis of Cognition at Carnegie Mellon University. He received a BA in Computer Science at Rutgers University in 1978, and earned a Master's degree and a Ph.D. (1984) in Computer Science at Carnegie Mellon University. Touretzky has worked as an Internet activist in favor of freedom of speech, especially what he perceives as abuse of the legal system by government and private authorities. He is a notable critic of Scientology.



Touretzky's research interests lie in the fields of artificial intelligence, computational neuroscience, and learning. This includes machine learning and animal learning, and in particular neural representation of space in rodents (e.g., in the hippocampus) and in robots. In 2006 he was recognized as a Distinguished Scientist by the Association for Computing Machinery.[1]

Criticism of Scientology

Since the late 1990s, Touretzky has worked to expose the actions of the Church of Scientology. He sees the actions of the organization as a threat to free speech, and he has taken a prominent part in Internet-based activism to oppose it, also appearing regularly as a critic in radio and print. He has also worked to expose what he sees as dangerous and potentially life-threatening treatments provided by Narconon, the Scientology-based drug rehabilitation program. He maintains a Web site entitled Stop Narconon, which archives media articles critical of the program. Dr. Touretzky's research into Narconon was a primary source of information for a series of San Francisco Chronicle newspaper articles criticizing Narconon on June 9 and June 10, 2004 that ultimately led to the organization's program being rejected by the California school system in early 2005.

Free speech activism

David Touretzky is an Internet free speech activist. He has supported several movements in what he perceives as abuse of the legal system by government and private authorities:

  • In 2000, Touretzky testified as an expert witness for the defense in Universal City Studios et al. v. Reimerdes et al., a suit brought by seven motion picture studios against the publishers of 2600: The Hacker Quarterly (the case name refers to Shawn Reimerdes, an unrelated defendant who settled prior to trial.) The suit concerned the publication of DVD decryption software known as DeCSS, which the plaintiffs asserted was illegal under the Digital Millennium Copyright Act. Dr. Touretzky testified as an expert in computer science on the expressive nature of computer code, and convinced the court that code was indeed speech. Touretzky also created an online gallery of various renditions of the DeCSS software. Readers sent in their own renditions of the decryption algorithm, including a mathematical description, a haiku, and a square dance.
  • In reaction to the federal prosecution and eventual imprisonment of 18-year old political activist Sherman Austin for hosting bomb-making instructions entitled Reclaim Guide on his web site, Dr. Touretzky provided a mirror on his Carnegie Mellon website for more than two years.


    "No wonder Scientology hates the Internet."

    Publications by Touretzky


    • David S. Touretzky, The Mathematics of Inheritance Systems (Research Notes in Artificial Intelligence) , Los Altos, California: Morgan Kaufmann, 1986. ISBN 0-934613-06-0.
    • David S. Touretzky, Common Lisp: A Gentle Introduction to Symbolic Computation, Redwood City, California: Benjamin Cummings, 1990. ISBN 0-8053-0492-4. Out of print, but electronic versions are available.


    • David S. Touretzky, "Viewpoint: Free speech rights for programmers", Communications of the ACM 44(8):23–25, August 2001. DOI:10.1145/381641.381651, extended version. (On DeCSS.)
    • David S. Touretzky and Peter Alexander, "A church's lethal contract", Razor, 2003. (On Scientology.)


    • David S. Touretzky et al., "Gallery of CSS descramblers".
    • Advances in Neural Information Processing Systems 8: Proceedings of the 1995 Conference (editor) ISBN 0-262-20107-0
    • Advances in Neural Information Processing Systems 7: Proceedings of the 1994 Conference (editor) ISBN 0-262-20104-6
    • Proceedings of the 1993 Connectionist Models Summer School (co-author) ISBN 0-8058-1590-2
    • Connectionist Models: Proceedings of the 1990 Summer School (co-author) ISBN 1-55860-156-2
    • Proceedings of the 1988 Connectionist Models (co-author) ISBN 1-55860-035-3


    1.  Nanette Asimov, "Schools urged to drop antidrug program, Scientology-linked teachings inaccurate, superintendent says", San Francisco Chronicle, February 23, 2005.
    2.  David Touretzky, "OT III Scholarship Page" online document, version of January 19, 1997
    3.  David Touretzky, "The NOTs Scholars Home Page" online document, undated version
    4.  Reader letters, Razor, February 2004.
    5.  "The Steve and D.C. Show", Xenu TV, July 14, 2005.
    6.  David S. Touretzky, "What the FBI doesn't want you to see at", online document, version of July 12, 2005.
    7.  Break The Bank-DC S30 2001. (Touretzky's mirror of the bomb-making instructions hosted by Sherman Austin.)

    Further reading

    • Relating to DeCSS and MPAA v. 2600:
      • MPAA v. 2600, transcript of trial, day 6, July 25, 2000. (Complete text of Dr. Touretzky's DeCSS testimony.)
      • Damian Cave, "A bug in the legal code?",, September 13, 2000.
      • Declan McCullagh, "A thorn in Hollywood's side", Wired, March 20, 2001.
      • David F. Gallagher, "Movie industry frowns on professor's software gallery", The New York Times, March 30, 2001.
      • David P. Hamilton, "Critics of DVD-copyright ruling argue constitution protects posting in all forms", The Wall Street Journal, April 12, 2001.
    • Relating to Dr. Touretzky's mirror of bomb-making instructions originally hosted by Sherman Austin:
      • Sarah Hennenberger, "Author of explosives guide web site in court", The Tartan (Carnegie Mellon campus newspaper), 2002.
      • Karen Welles, "CMU professor's web site causing controversy, site offers info on bomb-making", Target 11, WPXI, Pittsburgh, Pennsylvania, May 2, 2003.
      • John Middleton, "Ethics and tax dollars", Citizens Against Government Waste (an organization backed by Microsoft and the tobacco industry [8]), May 1, 2004.

    This article might use material from a Wikipedia article, which is released under the Creative Commons Attribution-Share-Alike License 3.0.

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