Atty. Mary S. Johnson
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.
Profile Summary
About Mary S. Johnson at a glance
Mary S. Johnson is a personal injury, class action, product liability, litigation, and environmental attorney based in Mandeville, Louisiana, practicing at Johnson Gray McNamara LLC. Admitted to practice in Louisiana, Louisiana State Bar Association. Educated at Loyola University New Orleans (J.D., 1986) and Loyola University New Orleans (—, 1986). Recognitions include Best Lawyers in America — Environmental Law (2026), Best Lawyers in America — Insurance Law (2026), and Best Lawyers in America — Litigation - Environmental (2026). Serands clients in Mandeville, LA and the surrounding metropolitan area.
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About
- 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
Practice Areas Explained
Mary S. Johnson's Areas of Practice
Each practice area below reflects the types of cases Mary S. Johnson handles, with a brief overview of what that area of law covers.
Personal injury attorneys help accident victims recover compensation for medical bills, lost wages, and pain & suffering. Most work on contingency — no fee unless you win.
Mary S. Johnson is one of 264,852 personal injury attorneys indexed nationally. Browse personal injury attorneys in Louisiana →
Mary S. Johnson is one of 26,424 class action attorneys indexed nationally. Browse class action attorneys in Louisiana →
Mary S. Johnson is one of 66,193 product liability attorneys indexed nationally. Browse product liability attorneys in Louisiana →
Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.
Mary S. Johnson is one of 454,532 litigation attorneys indexed nationally. Browse litigation attorneys in Louisiana →
Environmental attorneys for regulatory compliance, contamination, land use, and natural resource law.
Mary S. Johnson is one of 56,434 environmental attorneys indexed nationally. Browse environmental attorneys in Louisiana →
Jurisdictional Context
Why local counsel matters in Louisiana
Practicing law in Louisiana. Legal matters in Louisiana are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Mandeville are typically filed in the local municipal court or the appropriate Louisiana state district court, depending on subject matter and amount in controversy. An attorney licensed in Louisiana brings working knowledge of local procedural deadlines, judicial practices in this andnue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in Louisiana courts without local counsel or pro hac vice admission.
Looking for additional Louisiana attorneys? Browse all attorneys in Mandeville or all attorneys in Louisiana.
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