Leroy Gardner

Dr. Leroy U. Gardner was an American industrial pathologist who directed the Saranac Laboratory from 1927 to 1946. He conducted some of the earliest experimental studies on asbestos disease in animals and reported findings, including suspected cancer in mice exposed to asbestos, to the asbestos industry executives who funded his work. His correspondence and unpublished data later became central evidence that the industry knew of asbestos hazards decades before warning workers or the public.

Origin

Leroy Upson Gardner (1888–1946) trained as a physician and pathologist and led the Saranac Laboratory, an institution originally focused on tuberculosis that became a leading center for occupational lung disease research in the 1930s and 1940s. His asbestos research was commissioned and financially supported by Johns-Manville, Raybestos-Manhattan, and other major asbestos companies beginning in the late 1920s.

Significance in Asbestos Context

Gardner's work is a cornerstone of the "state-of-the-art" evidence used in asbestos litigation to show that manufacturers knew, or should have known, about the dangers of asbestos long before they acted. In a 1943 letter to industry executives, Gardner reported that 81.8% of long-surviving mice exposed to asbestos developed lung tumors, a striking early signal of carcinogenicity. Industry sponsors pressured him to downplay or omit the cancer findings from publication, and after his death in 1946 the published version of his work was edited to remove or soften these conclusions. For patients and families, the Gardner correspondence is frequently cited in punitive damages claims and in arguments that defendants engaged in fraudulent concealment, because it documents direct corporate knowledge of asbestos-caused cancer years or decades before warnings appeared on products.

Example Sentence

The plaintiff's state-of-the-art expert pointed to Dr. Leroy Gardner's 1943 Saranac correspondence to show that Johns-Manville knew asbestos caused cancer in laboratory animals long before my father began working with their pipe insulation.

Related Terms

Saranac Laboratory, State of the Art, Sumner Simpson Papers, Johns-Manville, Fraudulent Concealment, Punitive Damages, Failure to Warn, Notice

Notes

• If your exposure occurred after the late 1930s, ask your legal team whether Gardner's correspondence and the related Saranac Laboratory records are part of the state-of-the-art evidence in your case.
• Preserve any employment records showing when and where you (or your loved one) worked with asbestos products. The date of first exposure determines which historical knowledge documents are most relevant.
• The Gardner materials are often paired with the Sumner Simpson Papers and the 1949 Saranac Symposium proceedings; ask whether all three bodies of evidence apply to the defendants named in your case.
• For mesothelioma and lung cancer claims in particular, Gardner's animal cancer findings are commonly used to support punitive damages. Make sure your attorney is pursuing this category of damages if your jurisdiction allows it.