John Welsh focuses his practice on representing management in all aspects of labor and employment law. A fellow of the College of Labor and Employment Lawyers, John is well recognized among the top practitioners in his field.

As an experienced litigator and former appellate and trial attorney for the National Labor Relations Board in Washington, D.C., and Boston, John has handled significant matters for clients across industry sectors. His experience includes matters involving unlawful discrimination, sexual harassment, breach of contract, whistleblowing, ERISA, wage and hour, employee privacy, defamation, noncompetition and trade secret cases. John has acted as lead trial counsel on employment cases in venues nationwide.

John is also an accomplished appellate advocate, having successfully argued appeals before the Massachusetts Supreme Judicial Court and various U.S. Circuit Courts of Appeals.

John provides practical counsel and business-focused advice to employers on a wide variety of employment concerns, including employee discipline and discharge, reductions-in-force, employment and separation agreements, hiring, employment policies and handbooks, internal investigations and compliance. He regularly  conducts investigations for employers involving allegations of workplace misconduct, including  sexual harassment and unlawful discrimination. He handles collective bargaining negotiations and arbitrations, as well as unfair labor practice and representation cases before the National Labor Relations Board. Further, John advises employers on lawful and effective union avoidance strategies.


Prior to joining Armstrong Teasdale, John co-founded Bello Welsh LLP, a boutique employment firm. Before that, he was a partner for 13 years at Testa Hurwitz & Thibeault LLP, a 400-attorney firm in Boston where he held a variety of managerial positions, including chair of the Labor and Employment Practice, Management Committee Member and Chief Operating Officer. Earlier in his career, John was an appellate and trial attorney for the National Labor Relations Board in Washington, D.C., and Boston. He is former vice president of the NLRB Professional Association.


  • Boston College Law School  (J.D., cum laude, 1980)
    • Boston College International and Comparative Law Review (Editorial Board)
  • Catholic University of America  (B.A., cum laude, 1977)


  • Massachusetts
  • Supreme Court of Massachusetts
  • U.S. Court of Appeals, First Circuit
  • U.S. Court of Appeals, Second Circuit
  • U.S. Court of Appeals, Third Circuit
  • U.S. Court of Appeals, Fourth Circuit
  • U.S. Court of Appeals, Fifth Circuit
  • U.S. Court of Appeals, Sixth Circuit
  • U.S. Court of Appeals, Seventh Circuit
  • U.S. Court of Appeals, Eighth Circuit
  • U.S. Court of Appeals, Ninth Circuit
  • U.S. Court of Appeals, Eleventh Circuit

Professional Activities

  • College of Labor and Employment Lawyers (Fellow)
  • Litigation Counsel of America (Fellow)
  • American Bar Association
  • Massachusetts Bar Association
  • American Bar Foundation (Fellow)
  • Law360 Editorial Advisory Board (2022)

Charitable and Civic Involvement

  • Transitions Centers (Board Member)
  • St. John’s High School (Former Board Member)
  • Somerville Cambridge Elder Services, St. John’s High School, and Veterans, Inc.


  • Chambers USA: America’s Leading Lawyers for Business (2005-present)
  • Benchmark Litigation, Labor and Employment Star, Massachusetts (2022)
  • The Best Lawyers in America®, Lawyer of the Year (2021); Employment law - Management, Labor Law - Management (2006-present)
  • Martindale Hubble, AV® Preeminent Rated
  • Massachusetts Super Lawyers® (2003-present); Top 100 Lawyers in New England (2007-2020, end of eligibility); Top 100 Lawyers in Massachusetts (2006-2020); Top 10 Massachusetts Super Lawyers (2017)
Contact Us
  • Worldwide
  • Boston, MA
  • Chicago, IL
  • Denver, CO
  • Dublin, Ireland
  • Edwardsville, IL
  • Jefferson City, MO
  • Kansas City, MO
  • Las Vegas, NV
  • London, England
  • Miami, FL
  • New York, NY
  • Orange County, CA
  • Philadelphia, PA
  • Princeton, NJ
  • Salt Lake City, UT
  • St. Louis, MO
  • Washington, D.C.
  • Wilmington, DE
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Boston, MA
800 Boylston St.
30th Floor
Boston, MA 02199
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Chicago, IL
100 North Riverside Plaza
Suite 1500
Chicago, IL 60606-1520
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Denver, CO
4643 S. Ulster St.
Suite 800
Denver, CO 80237
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Dublin, Ireland
Fitzwilliam Hall, Fitzwilliam Place
Dublin 2, Ireland
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Edwardsville, IL
115 N. Second St.
Edwardsville, IL 62025
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Edwardsville, Illinois
Jefferson City, MO
101 E. High St.
First Floor
Jefferson City, MO 65101
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Kansas City, MO
2345 Grand Blvd.
Suite 1500
Kansas City, MO 64108
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Las Vegas, NV
7160 Rafael Rivera Way
Suite 320
Las Vegas, NV 89113
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London, England
Royal College of Surgeons of England
38-43 Lincoln’s Inn Fields
London, WC2A 3PE
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355 Alhambra Circle
Suite 1200
Coral Gables, FL 33134
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New York, NY
7 Times Square, 44th Floor
New York, NY 10036
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19800 MacArthur Boulevard
Suite 300
Irvine, CA 92612
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2005 Market Street
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Philadelphia, PA 19103
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Princeton, NJ
100 Overlook Center
Second Floor
Princeton, NJ 08540
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Salt Lake City, UT
222 South Main St.
Suite 1830
Salt Lake City, UT 84101
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St. Louis, MO
7700 Forsyth Blvd.
Suite 1800
St. Louis, MO 63105
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Washington, D.C.
1717 Pennsylvania Avenue NW
Suite 400
Washington, DC 20006
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Wilmington, DE
1007 North Market Street
Wilmington, DE 19801
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Wilmington, Delaware