Thomas B. Mason
Partner
Thomas B. Mason represents lawyers and law firms on professional responsibility and ethics matters, including malpractice, disqualification, disciplinary investigations and prosecutions, partner admissions and departures, and law firm dissolutions. Mr. Mason’s disciplinary experience includes matters before the USPTO’s Office of Enrollment and Discipline (OED) as well as numerous state bars. He also counsels and advises lawyers and law firms in all of the above areas so as to avoid problems or disputes before they arise. Mr. Mason was named Washington, D.C., Ethics and Professional Responsibility Lawyer of the Year for 2014, 2017, 2019, and Legal Malpractice Law – Defendants Lawyer of the Year for 2018 by Best Lawyers. He was also selected to Excellence in Practice for five years by Super Lawyers. He has served as an expert in ethics and related issues on numerous occasions.
Some of his most notable representations include:
- On behalf of a national telecommunications carrier, obtained a dismissal at the pleading stage of a claim for nearly $10 million in outstanding legal fees purportedly due to the former outside counsel.
- Handled dozens of disciplinary complaints and disqualification controversies, obtaining many outright dismissals and often dissuading opposing counsel from filing motions to disqualify.
- Successfully defeated a motion to disqualify brought by one AmLaw 100 firm against another AmLaw firm.
- Litigated numerous malpractice cases at both the appellate and trial level. Obtained dismissals of all counts at the motion to dismiss stage on behalf of multiple clients based on ripeness, causation, and damage issues.
- Regularly represents the District of Columbia Public Defender Service, the Legal Aid Society of the District of Columbia, Bread for the City, and other legal service organizations and their lawyers on a pro bono basis.
Prior to private practice, Mr. Mason worked for the Federal Public Defender for the District of Maryland, where he represented clients in a wide variety of cases, including espionage, civil rights, mail and wire fraud, and controlled substance prosecutions. He went on to join the District of Columbia Public Defender Service where he had an intensive criminal trial and appellate practice.
Mr. Mason is a member of the American Bar Association’s Standing Committee on Ethics and Professional Responsibility and the D.C. Bar’s Global Legal Practice Committee. Mr. Mason served on the D.C. Bar Legal Ethics Committee from 2006 to 2012, including three terms as Chair from 2009 to 2012. Mr. Mason also served on the D.C. Bar Rules of Professional Conduct Review Committee from 2002 to 2008 and then again from 2013 to 2020, including terms as Vice-Chair and Chair. During his tenure, the Committee adopted the most extensive revisions to the D.C. Rules of Professional Conduct since the D.C. Bar adopted the Rules in 1991.
Mr. Mason speaks and writes frequently on ethics and malpractice matters. He is a frequent speaker at the D.C. Bar and has also spoken before various sections of the American Bar Association, the Practising Law Institute, the American Law Institute and a number of other bar and industry organizations. He has written on topics such as non-lawyer partners and multiple “of counsel” relationships with different law firms. Mr. Mason has taught ethics and professional responsibility at the Georgetown University School of Law from 2008 to 2016 and has taught various subjects at the National Institute of Trial Advocacy, Columbus School of Law at Catholic University and American University’s Washington College of Law.
He is AV Peer Review rated by Martindale-Hubbell with a 5.0 out of 5.0 rating, High Ethical Standing and Highest Level of Professional Excellence.
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June 24, 2016
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June 21, 2016
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October 13, 2015
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June 03, 2015
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July 17, 2014
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January 01, 2014
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December 18, 2013
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November 11, 2013
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October 23, 2013
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July 01, 2013
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January 30, 2013
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December 01, 2012
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November 16, 2012
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January 01, 2011
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June 28, 2010
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October 01, 2007
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August 15, 2019
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August 15, 2018
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August 15, 2017
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June 14, 2017
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May 01, 2017
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November 01, 2016
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August 15, 2016
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November 02, 2015
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August 19, 2015
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August 17, 2015
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April 27, 2015
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January 06, 2015
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January 05, 2015
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January 26, 2021
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January 07, 2021
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October 23, 2020
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September 24, 2020
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July 14, 2020
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June 10, 2020
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May 27, 2020
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February 26, 2020
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February 24, 2020
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October 31, 2019
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October 18, 2019
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May 09, 2019
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April 25, 2019
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November 13, 2018
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October 31, 2018
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October 10, 2018
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September 19, 2018
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September 05, 2018
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June 12, 2018
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September 28, 2017
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April 19, 2017
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March 17, 2017
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March 08, 2017
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February 23, 2017
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January 26, 2017
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January 05, 2017
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October 31, 2016
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October 25, 2016
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October 06, 2016
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September 28, 2016
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August 16, 2016
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June 13, 2016
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May 27, 2016
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April 18, 2016
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March 01, 2016
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February 23, 2016
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December 07, 2015
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October 30, 2015
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October 29, 2015
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September 28, 2015
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August 06, 2015
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July 29, 2015
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May 28, 2015
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April 30, 2015
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April 27, 2015
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March 16, 2015
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March 03, 2015
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February 26, 2015
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February 25, 2015
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February 03, 2015
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January 13, 2015
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December 04, 2014
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October 31, 2014
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October 03, 2014
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October 01, 2014
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September 30, 2014
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September 19, 2014
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September 18, 2014
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August 07, 2014
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June 18, 2014
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April 11, 2014
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February 27, 2014
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December 17, 2013
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October 27, 2013
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October 10, 2013
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September 17, 2013
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August 15, 2013
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July 31, 2013
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July 16, 2013
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June 13, 2013
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June 04, 2013
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June 03, 2013
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May 23, 2013
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May 10, 2013
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April 19, 2013
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January 31, 2013
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January 26, 2013
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January 09, 2013
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November 16, 2012
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September 25, 2012
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August 07, 2012
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May 23, 2012
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April 25, 2012
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February 13, 2012
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January 11, 2012
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May 26, 2011
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May 17, 2011
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April 06, 2011
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March 22, 2011
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September 02, 2010
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August 24, 2010
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June 29, 2010
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June 28, 2010
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May 25, 2010
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May 24, 2010
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March 23, 2010
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September 15, 2009
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May 28, 2009
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November 18, 2008
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September 27, 2008
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March 15, 2007