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Margaret P. "Penny" Mason

545 Long Wharf Drive
Ninth Floor
New Haven, Connecticut 06511
Phone:  203.672.3213
Fax:  203.672.3230


Ms. Mason has over 30 years of trial experience in federal and state courts, representing businesses and physicians. She has focused her practice on complex litigation, medical malpractice defense and employment law including defense of wrongful discharge, age, sex and race discrimination claims, breach of employment contracts and related torts. Ms. Mason has provided day-to-day employment advice for large and small businesses and institutions. She has represented business clients in a variety of complex litigations. She has also represented medical and legal professionals in administrative proceedings before licensing boards. She serves as Counsel to the Federal Grievance Committee of the US District Court, Connecticut and as an independent investigator of sexual misconduct claims at academic institutions and other organizations.

Published Works

  • General Editor, LexisNexis Practice Guide: Connecticut Civil Pretrial Practice, 2016 Edition, updates 2017, 2018.
  • Courting Reversal: The Supervisory Role of State Supreme Courts, 87 Yale L.J. 1191 (1978).

Legal Experience

  • LeClairRyan, New Haven, Connecticut, September 2008 – Present
  • Tyler Cooper & Alcorn, LLP, New Haven, Connecticut, 1978 – 2008

Memberships and Affiliations

  • American Law Institute
  • American Bar Association
  • American Bar Foundation: Fellow
  • Connecticut Bar Association: Federal Judiciary Committee; Past Co-Chair, Federal Practice Section; Executive Committee, Federal Practice Section
  • Connecticut Bar Foundation: Fellow
  • Federal Bar Council
  • New Haven County Bar Association: President, 1994-1995; Executive Committee
  • New Haven County Bar Foundation: President, 1994-1997
  • Benchers
  • Mory’s Association 
  • The Club at Mory’s: Secretary pro tem

Board Memberships

  • The John B. Pierce Foundation, Trustee
  • The John B. Pierce Laboratory, Director
  • Chloe's Closet, Inc.


  • Recognized as AV Preeminent (5.0 out of 5.0) by Martindale-Hubbell every year since 1987
  • Professional Excellence, Lifetime Achievement Award recipient, Connecticut Law Tribune, 2016
  • Recipient of Connecticut Bar Association’s Edward F. Hennessey Award for Professionalism, 2014
  • Equal Access to Justice Award, Friends of New Haven Legal Assistance Association, Inc., 2010
  • Merit Selection Committee for Magistrate Judges, 2010 – 2012, appointed by Chief Judge Thompson, USDC, Connecticut
  • Special Master, USDC, Connecticut, 2005 – 2009
  • Statewide Grievance Committee, 1995 – 2000, Chair 1996 – 2000
  • Listed among The Best Lawyers in America® in the areas of Employment Law - Management, Medical Malpractice Law - Defendants, and Personal Injury Litigation - Defendants from 2003 – 2019. For more information on the selection process, click here.
  • Named Best Lawyers' Employment Law – Management "Lawyer of the Year" for New Haven, CT in 2017 and 2019.
  • Recognized by Law & Politics magazine as a Connecticut "Super Lawyer" in the areas of Personal Injury Defense (Medical Malpractice), Employment & Labor, and General Litigation from 2006 – 2018. For more information on the selection process, click here.
  • Recognized by Law & Politics Magazine as one of the "Top 25 Women Super Lawyers in Connecticut", 2009, 2012, 2013 & 2014 
  • Recognized by Law & Politics Magazine as one of the "Top 50 Women Attorneys in New England," 2009 & 2010
  • Recognized by Connecticut Magazine, Super Lawyers Section, as one of the “Top Attorneys in Connecticut, 2008 & 2009" in the areas of Employment & Labor, Personal Injury Defense (Medical Malpractice), and General Litigation. For more information on the selection process, click here.
  • Recognized by New York Magazine as “New York Area Top Lawyer, 2012”
  • Selected by American Trial Lawyers Association to 2007 “Top 100 Trial Lawyers”
  • Selected by The National Trial Lawyers to “Top 100 Trial Lawyers,” 2008 – 2010
  • Recognized for professional services by the New Haven Business Times, 1998
  • Featured attorney in the Connecticut Law Tribune’s 2008 special section entitled "Women in the Law" which showcases high-achieving women in the practice of law

Related Industries


  • J.D., Yale Law School, 1978, Board of Editors, Yale Law Journal, 1977-1978; Danforth Fellow
  • B.A., English, Phi Beta Kappa, Goucher College, 1975
  • Randolph-Macon Woman's College

Bar Admissions

  • Connecticut, 1978

Court Admissions

  • United States Supreme Court, 1982
  • U.S. District Court for the District of Connecticut, 1978
  • U.S. Court of Appeals for the Second Circuit, 1980