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)
    • President’s Scholar
    • Blue Key National Honor Society
    • Division I Intercollegiate Athlete


  • 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)

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. (Pro Bono Counsel)


  • Chambers USA: America’s Leading Lawyers for Business (2005-present)
  • The Best Lawyers in America® (Lawyer of the Year, 2021; Management-Side Labor Law, 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-present); Top 10 Massachusetts Super Lawyers (2017)
Contact Us
  • Worldwide
  • Boston, MA
  • Denver, CO
  • Edwardsville, IL
  • Jefferson City, MO
  • Kansas City, MO
  • Las Vegas, NV
  • London, England
  • New York, NY
  • Philadelphia, PA
  • Princeton, NJ
  • Salt Lake City, UT
  • St. Louis, MO
  • Wilmington, DE
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Boston, MA
800 Boylston St.
30th Floor
Boston, MA 02199
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Boston, Massachusetts
Denver, CO
4643 S. Ulster St.
Suite 800
Denver, CO 80237
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Denver, Colorado
Edwardsville, IL
115 N. Second St.
Edwardsville, IL 62025
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Edwardsville, Illinois
Jefferson City, MO
3405 W. Truman Boulevard
Suite 210
Jefferson City, MO 65109
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Jefferson City, Missouri
Kansas City, MO
2345 Grand Blvd.
Suite 1500
Kansas City, MO 64108
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Kansas City, Missouri
Las Vegas, NV
3770 Howard Hughes Parkway
Suite 200
Las Vegas, NV 89169
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Las Vegas, Nevada
London, England
200 Strand
London, WC2R 1DJ
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New York, NY
919 Third Ave., 37th Floor
New York, NY 10022
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New York City
Philadelphia, PA
2005 Market Street
29th Floor, One Commerce Square
Philadelphia, PA 19103
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Philadelphia, Pennsylvania
Princeton, NJ
100 Overlook Center
Second Floor
Princeton, NJ 08540
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Princeton, New Jersey
Salt Lake City, UT
201 South Main Street
Suite 750
Salt Lake City, UT 84111
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Salt Lake City, Utah
St. Louis, MO
7700 Forsyth Blvd.
Suite 1800
St. Louis, MO 63105
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St. Louis, Missouri
Wilmington, DE
300 Delaware Avenue
Suite 210
Wilmington, DE 19801
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Wilmington, Delaware