Mary S. Johnson

Mary S. Johnson


Johnson Gray McNamara, LLC

Recognized since 2008

Mandeville, Louisiana

Practice Areas

Environmental Law

Insurance Law

Litigation - Environmental

Mass Tort Litigation / Class Actions - Defendants

Personal Injury Litigation - Defendants

Lawyer of the Year Badge - 2022 - Mass Tort Litigation / Class Actions - Defendants
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Ms. Johnson is active in the defense of complex environmental, toxic tort, chemical exposure, carbon monoxide, insurance coverage, medical monitoring, naturally occurring radioactive material (“NORM”) occupational injury cases, oyster, oil spill, pesticide, personal injury, property damage, and class action litigation. She also has an active mediation and appellate practice in the same areas. Ms. Johnson has particular abilities in defending premises owners, employers and their executive officers in occupational exposure and related medical monitoring litigation throughout Louisiana. She is defending a number of cases alleging damage to coastal marshes, wetlands, oyster leases, property and global warming claims relating to Hurricane Katrina. She also has substantial experience in multi-party and class action lawsuits, and has handled a number of consolidated NORM, asbestos, pesticide, silica and chemical exposure cases. She defended a major shipyard in the In re: Combustion Inc. toxic tort litigation that included 17 toxic tort suits with over 12,000 plaintiffs alleging personal injury, property damage, and “fear of cancer” against 84 defendants, in addition to third-party demands against over 300 generator companies, the United States Government and the insurers of the former site owners and operators. Ms. Johnson successfully pursued the site owners, operators and their insurers in a CERCLA cost recovery action on behalf of a PRP Group. She was selected for inclusion in The Best Lawyers in America for Environmental Law, Mass Tort Litigation and Personal Injury Litigation 2008-2010.


Other Professional Experience:
Founding Member (Nov 2005- Present) Johnson Gray McNamara LLC

Partner (1994 – 2005) and Associate (1988 – 1993) Liskow & Lewis

Law Clerk to the Honorable Wallace A. Edwards, First Circuit Court of Appeal, Louisiana, 1986 – 1988


Year Admitted to Practice:
1986


Education:
Tulane University (B.A., 1983)

Loyola University (J.D., cum laude, 1986)


Law School Honors :
Member, Loyola Law Review

Board Member, Loyola Moot Court Intramural Coordinator

Contact & Links
Location
  • 21357 Marion Lane, Suite 300
    Mandeville, LA 70471
Demographics
  • Gender: Female
  • Ethnicity: White
Education
  • Loyola University New Orleans, J.D., graduated 1986
  • Loyola University New Orleans, graduated 1986
Bar Admissions
  • Louisiana, Louisiana State Bar Association
State Clerkships
  • Louisiana - Intermediate Appellate Courts

Lawyer of the Year Badge - 2022 - Mass Tort Litigation / Class Actions - Defendants
Named "Lawyer of the Year" by Best Lawyers® for:
  • Mass Tort Litigation / Class Actions - Defendants, New Orleans (2022)
Recognized in The Best Lawyers in America® 2025 for work in:
  • Environmental Law
  • Insurance Law
  • Litigation - Environmental
  • Mass Tort Litigation / Class Actions - Defendants
  • Personal Injury Litigation - Defendants
Special Focus:
  • Appellate
  • Asbestos
  • Civil Litigation
  • Climate Change
  • Environmental
  • Insurance
  • Litigation
  • Mass Tort
  • Occupational Disease
  • Punitive Damages
  • Superfunds/Environmental Remediation
  • Toxic Tort
Additional Areas of Practice:
  • Mass Tort Litigation
  • Personal Injury Litigation

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Publications

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