He is best known for his reports on the Guantanamo Bay detention camp and its operations. Denbeaux has testified to Congress about the findings of the Center's reports. He and his son, Joshua Denbeaux, are the legal representatives of two Tunisian detainees at Guantanamo. 
He is also the lead Civilian Military Commission Counsel for two detainees who were tortured by the Central Intelligence Agency
in black sites
prior to their detainment. Denbeaux is an expert in forensics and has testified as an expert witness in cases across the country.
Denbeaux also is a practicing attorney in the family law firm of Denbeaux & Denbeaux in Westwood, New Jersey
Early life and education
Mark Denbeaux at the March towards Selma
Denbeaux received his B.A. from College of Wooster
An active supporter of civil rights in the 1960s, Denbeaux participated in the March on Washington
on August 28, 1963. Denbeaux later founded a NAACP
chapter in Wooster. The Wooster NAACP eventually became the Wooster Orville NAACP because it was too large to be run by students. He was later honored and asked to speak at the 50th anniversary Freedom Dinner in 2015. He participated in the Selma to Montgomery marches
for voting rights in 1965.
After graduating from NYU Law School in 1968, Denbeaux became a founding member of the South Bronx Legal Services.
He served as the citywide coordinator for the Community Action for Legal Services, New York's organization of antipoverty lawyers, from 1970 to 1972. During this time he also filed complaints against judges for hostility towards poor people. 
In the early 1970s, Denbeaux represented a number of U.S. soldiers charged with disobeying orders during the Vietnam War
and the anti-war
movement. He defended some in courts martial.
Seton Hall University School of Law
In 1972, Denbeaux joined the Seton Hall Law School Faculty. He has taught courses including Evidence, Remedies, Uniform Commercial Code, Contracts, Professional Responsibility, Federal Civil Procedure, Torts, and Constitutional Law. He has been an elected member of the American Law Institute
In 2006, Denbeaux founded the Center for Policy and Research
at Seton Hall University Law School. This work was originally inspired by Denbeaux's pro bono
representation of two Guantanamo detainees.
He and his son are among more than 100 attorneys who have represented detainees there.
The Center produces analytic reports in three key areas: interrogations and intelligence, national security, and forensics. Under Denbeaux's supervision, students working as research fellows in teams develop skills in pattern recognition, factual evaluation, and data analysis; Seton Hall University has published their original reports on issues concerning law and public policy.
Denbeaux is well known for the Center's Guantanamo Reports, studies of United States operations and policies at the Guantanamo Bay detention camp
; by late 2009, fifteen studies had been published in this series.
The law research fellows have systematically analyzed data published by the Department of Defense; they have reviewed more than 100,000 pages of government documents procured through the Freedom of Information Act
. The first report was a statistical analysis of characteristics of the 517 detainees held in 2005. The Guantanamo Reports have been widely cited and published globally.
In 2005, Denbeaux began representing two Tunisian detainees, Rafiq Bin Bashir Bin Jalud Al Hami
and Lufti Bin Ali
. In 2009, al Hami was released to Slovakia. In 2011, bin Ali was released to Kazakhstan. In 2009, he began his pro bono representation of two more detainees, Abu Zubaydah
and Mohamad Farik Amin
. Denbeaux represented them in their habeas corpus petitions and remains the lead civilian defense counsel for both detainees. He has testified before the Senate Armed Services Committee and the Senate Judiciary Committee, as well as a variety of House and Senate subcommittees, regarding Guantanamo Bay and national security issues. 
Denbeaux is an expert in forensic testimony. He teaches an upper-level seminar at Seton Hall Law on forensic evidence. The course evaluates the reliability of experts who testify as to handwriting identification, fingerprint identification, ballistics, tool marks, blood spatter, bite marks, and other crime scene forensic evidence and witnesses. The analysis of these areas includes an evaluation of the reliability and validity of each area's conclusions, the value of each area's proficiency testing, and the methodology upon which the conclusions are reached.
In order to fully evaluate forensic evidence, the Center has established a crime laboratory, certified by the requisite proficiency tests. Its representatives have given expert opinions about the methodology used by specific forensic fields in court. Its written reports have been used in court proceedings. A significant part of the seminar includes participating in these projects.
Denbeaux has spoken on the subject of forensic science at dozens of academic gatherings and has testified as an expert witness on the limitations of forensic evidence more than fifty times in state and federal courts as well as in administrative proceedings.
His testimony has been cited in published cases in addition to the Third and Eleventh Circuits (U.S. v. Yagman
and U.S. v. Pettus
U.S. v. Yagman
Denbeaux offered testimony questioning the reliability of handwriting analysis in this 2007 trial. His testimony was limited to his observations about the limitations and/or flaws in handwriting analysis generally, not as specifically applicable to the facts in Yagman
U.S. v. Hines
Denbeaux served as an expert witness in U.S. v. Hines
, in which the government's motion to exclude Denbeaux's testimony was deemed moot. The government argued that Denbeaux's testimony did not meet the standards of Daubert
, while Denbeaux concluded that there is no need for expert testimony on handwriting analysis as it has never been proven reliable.
U.S. v. Ruth
In U.S. v. Ruth
, the issue in question was whether the military judge abused his discretion by denying production of Denbeaux, who was slated to testify as an expert critic of handwriting analysis.
Denbeaux defended Sydney Biddle Barrows
, the "Mayflower Madam
," in 1984. Barrows ran Cachet, an escort service in New York City, from 1979 until 1984, when the service was shut down. She was charged with promoting prostitution
by the Manhattan District Attorney's Office. She eventually pleaded guilty.
In 1997, Denbeaux served as a forensic expert for the trial of Timothy McVeigh
, charged with bombing the Oklahoma Federal Building.
Denbeaux serves as Attorney of Counsel for the family law firm Denbeaux and Denbeaux.
- Trial Evidence, (I.C.L.E.), (with Michael Risinger), 1978
- New Jersey Evidentiary Foundations, Denbeaux, Arseneault and Imwinkelried, The Michie Company, 1995.
- The Guantánamo Lawyers: Inside a Prison, Outside the Law, edited with Jonathan Hafetz, 2010
Center for Policy and Research, Guantanamo Reports
- Report on Guantanamo Detainees: A Profile of 517 Detainees through Analysis of Department of Defense Data, February 8, 2006 (with Joshua Denbeaux, David Gratz, John Gregorek, Matthew Darby, Shana Edwards, Shane Hartman, Daniel Mann, and Helen Skinner).
- Second Report on the Guantanamo Detainees: Inter- and Intra-Departmental Disagreements About Who Is Our Enemy, March 20, 2006 (with Joshua Denbeaux, David Gratz, John Gregorek, Matthew Darby, Shana Edwards, Shane Hartman, Daniel Mann, and Helen Skinner).
The Guantanamo Detainees During Detention: Data From Department of Defense Records
, July 10, 2006 (with Joshua Denbeaux, David Gratz, John Gregorek, Matthew Darby, Shana Edwards, Shane Hartman, Daniel Mann, Megan Sassaman, and Helen Skinner).
June 10 Suicides at Guantanamo,
August 21, 2006 (with Joshua Denbeaux, David Gratz, John Gregorek, Matthew Darby, Shana Edwards, Shane Hartman, Daniel Mann, Megan Sassaman, and Helen Skinner).
No-Hearing Hearings CSRT: The Modern Habeas Corpus? An Analysis of the Proceeding of the Government's Combatant Status Review Tribunals at Guantanamo
, November 17, 2006 (with Joshua Denbeaux, David Gratz, John Gregorek, Matthew Darby, Shana Edwards, Shane Hartman, Daniel Mann, Megan Sassaman, and Helen Skinner).
The Meaning of "Battlefield": An Analysis of the Government’s Representations of "Battlefield Capture" and "Recidivism" of the Guantánamo Detainees
, December 10, 2007 (with Joshua Denbeaux, Grace Brown, Jillian Camarote, Douglas Eadie, Jennifer Ellick, Daniel Lorenzo, Mark Muoio, Courtney Ray, and Nebroisa Zlatanovic).
Justice Scalia, the Department of Defense, and the Perpetuation of an Urban Legend: The Truth About the Alleged Recidivism of Released Guantánamo Detainees
, June 16, 2008 (with Joshua Denbeaux, Daniel Lorenzo, Mark Muoio, Grace Brown, Jennifer Ellick, Jillian Camarote, Douglas Eadie, and Paul Taylor).
Released Guantánamo Detainees and the Department of Defense: Propaganda by the Numbers?
, January 15, 2009 (with Joshua Denbeaux, R. David Gratz, Daniel Lorenzo, Mark Muoio, Grace Brown, Jullian Camarote, Douglas Eadie, Jennifer Ellick, Paul Taylor, Adam Deutsch, Michael Patterson, Gabrielle Hughes, and Michelle Fish).
- Torture: Who Knew? An Analysis of the FBI and Department of Defense Reactions to Harsh Interrogation Methods at Guantanamo, April 1, 2009 (with Joshua Denbeaux, David Gratz, Megan Sassaman, Daniel Mann, Mathew Darby, Michael Ricciardelli, Jennifer Ellick, Grace Brown, Jillian Camarote, Douglas Eadie, Daniel Lorenzo, Mark Muoio, and Courtney Ray).
- Revisionist Recidivism: A New Analysis of the Government's Representations of Alleged "Recidivism" of the Guantánamo Detainees, June 5, 2009 (with Joshua Denbeaux, David Gratz, Sean Camoni, Adam Deutsch, Michael McDonough, Michael Patterson, Michelle Fish, Gabrielle Hughes, Paul Taylor, Brian Beroth, Scott Buerkle, Megan Chrisner, Jesse Dresser, Shannon Sterritt, and Kelli Stout).
- Death in Camp Delta, December 7, 2009 (with Brian Beroth, Scott Buerkle, Sean Camoni, Meghan Chrisner, Adam Deutsch, Jesse Dresser, Doug Eadie, Michelle Fish, Marissa Litwin, Michael McDonough, Michael Patterson, Shannon Sterrit, Kelli Stout, and Paul Taylor).
DOD Contradicts DOD: An Analysis of the Response to Death in Camp Delta
, February 3, 2010 (with Brian Beroth, Scott Buerkle, Sean Camoni, Meghan Chrisner, Adam Deutsch, Jesse Dresser, Michelle Fish, Marissa Litwin, Michael McDonough, Michael Patterson, Shannon Sterritt, Kelli Stout, and Paul Taylor).
Guantanamo: America's Battle Lab
January 12, 2015 (with Jonathan Hafetz, Joshua Denbeaux, Erin Hendrix, Chelsea Perdue, Kelly Ross, Lauren Winchester, and Joseph Hickman).
- Drug Abuse: An Exploration of the Government's Use of Mefloquine at Guantanamo, February 12, 2011 (with Sean Camoni, Brian Beroth, Meghan Chrisner, Chrystal Loyer, Kelli Stout, and Paul Taylor).
- Rumsfeld Knew: DoD's "Worst of the Worst" and Recidivism Claims Refuted by Recently Declassified Memo, March 3, 2011 (with Sean Camoni, Paul Taylor, and Philip Taylor).
The Guantanamo Diet: Actual Facts About Detainee Weight Changes
, May 24, 2011 (with Paul Taylor, Sean Kennedy, Sean CAmoni, Kelly Ann Taddonio, Meghan Chrisner, Brian Beroth, Kelli Stout, Chrystal Loyer, Nick Stratton, Lauren Winchester, and Phillip Taylor).
Center for Policy and Research, Other Reports
- Global War on Terror Timeline: September 11, 2001 to January 20, 2009, January 5, 2017 (with Brian Beroth, Adam Deutsch, Nicholas Stratton, and Phillip Taylor).
- Racial Profiling report: Bloomfield Police and Bloomfield Municipal Court, April 7, 2016 (with Kelley Kearns and Michael J. Ricciardelli).
- The Government's Hostage: The Conviction and Execution of Ethel Rosenberg, December 15, 2016 (with Shannon Dolan, Robert Graber, Elizabeth Mancuso, and Theodore Tanzer).
- Costs and Consequences of Arming America's Law Enforcement with Combat Equipment, September 7, 2014 (with Jeremy Dack, Dakota Gallivan, Lucas Morgan, Jared Stepp, and Joshua Wirtshafter).
- Lehman Brothers: A License to Fail with Other People's Money, September 7, 2012 (with Edward Dabek, John Gregorek, Sean A. Kennedy, and Eric Miller).
- "Trust, Cynicism, and Machiavellianism Among First Year Law Students, 53 Journal of Urban Law 397" (1976).
- "Restitution and Mass Actions: A Solution to the Problems of Class Actions," 10 Seton Hall L. Rev. 273 (1979).
- "Questioning Questions: Problems of Form in the Interrogation of Witness," 33 Arkansas L. Rev. 439 (1980) (with Risinger).
- "The First Word of the First Amendment," Northwestern University L. Rev. (1988).
- "Exorcism of Ignorance as a Proxy for Rational Knowledge: The Lessons of Handwriting Identification 'Expertise'," U. of Pa. L. Rev. (1989) (with Risinger & Saks).
- "Brave New 'Post- Daubert World'--A Reply to Professor Moenssens," 29 Seton Hall L. Rev. 405 (1998) (with Risinger and Saks).
"Resignation in Protest: Political and Ethical Choices Between Loyalty to Team and Loyalty to Conscience in American Public Life," 4 Hofstra L. Rev. (1976).
- American Bar Foundation, 1974-78. Recipient of a grant, with Professor Alan Katz of Fairfield University, Fairfield, Connecticut, to conduct a longitudinal study on law student attitudes toward politics, law and legal education
- "Alteration or Elaboration: Does Law School Instill Cynicism?," (with Alan Katz), National Conferences on Teaching Professional Responsibility, Detroit, Michigan, Sept. 1977
- ^ "Mark Denbeaux". Seton Hall Law. SHU School of Law. Retrieved 20 January 2016.
- ^ a b c d "Mark Denbeaux". Seton Hall Law Faculty Profile. Seton Hall Law. Retrieved 27 February 2012.
- ^ a b Di Ionno, mark. "The Selma march and the fascinating story behind an iconic photo", The Star-Ledger, March 4, 2015. Accessed November 23, 2017. "The historic photo is a little grainy, produced in black-and-white. That was not by choice, as some artistic metaphor; color photography in 1965 was expensive to print. The picture was part of Ebony magazine's coverage of the third Alabama voting rights march from Selma to Montgomery, which began on March 21, 1965.... 'My father was a combat chaplain with (Gen. George) Patton's 3rd Army,' Denbeaux said during an interview at his home in Woodcliff Lake."
- ^ "Mark Denbeaux". Mark Denbeaux: Attorney Biography. Denbeaux & Denbeaux Attorneys at Law. Archived from the original on 22 February 2012. Retrieved 27 February 2012.
- ^ McFadden, Robert (December 21, 1970). "Some Judges Held Hostile to Poor". New York Times. Retrieved October 29, 2019.
- ^ "Jeffrey S. Brand". Jeffrey S. Brand Biography. University of San Francisco School of Law. Archived from the original on 19 June 2010. Retrieved 27 February 2012.
- ^ a b "Mark Denbeaux". Denbeaux & Denbeaux: Attorney Profile. Denbeaux & Denbeaux Attorneys at Law. Archived from the original on 22 February 2012. Retrieved 27 February 2012.
- ^ a b c "Center for Policy & Research". Seton Hall Law. Retrieved 17 March 2012.
- ^ a b Richard Bernstein, Letter from America: "Guantánamo Lawyers Showed Their Moral Fiber", New York Times, 8 October 2010, accessed 10 February 2013
- ^ 
- ^ U.S. v. Yagman, 2007 U.S. Dist. LEXIS 95505, p. 3
- ^ U.S. v. Hines, 55 F. Supp. 2d 62 (1999 U.S. Dist. Lexis 9306), p. 68
- ^ U.S. v. Ruth, 46 M.J. 1; 1997 CAAF LEXIS 15, US Court of Appeals for the Armed Forces
- ^ Haden-Guest, Anthony (Dec 10, 1984). "The Story of the Mayflower Madam". New York Magazine. Retrieved 27 February 2012.
- ^ Jones, Stephen (1998). Others Unknown: Timothy Mcveigh and the Oklahoma Bombing. Public Affairs. ISBN 1-58648-098-7.
- ^ "Denbeaux & Denbeaux". Denbeaux & Denbeaux Attorneys at Law. Retrieved 27 February 2012.
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