Leahy had an expanding vision of records management. As an archivist on the staff of the National Archives he developed techniques to reduce the volume of public records and to segregate records of enduring value from those of temporary value. As Director of Records Administration for the Navy he established records centers for the storage of records no longer required for current business or storage and introduced standard paragraphs for repetitive correspondence.
The Records Management Task Force for the Hoover Commissions (1947 - 48 and 1950) that Leahy directed produced reports that exposed the waste and mismanagement of paper records by federal agencies. The Records Management Task Force also advocated the establishment of a federal records management program that resulted in the Federal Records Act of 1950.
For more than a decade Leahy demonstrated that the tools and techniques used to promote work simplification and to reduce the volume of useless and duplicated records of federal agencies could be successfully implemented in the private sector.
Several of Leahy's contemporaries have noted his remarkable ability to present powerful arguments to senior managers on behalf of records management. Part of this ability stemmed from his graphic descriptions of waste, duplication, and inefficiency in the way many records were being managed and how substantial cost savings could be achieved through the proper reduction of records and introduction of work simplification. Leahy made equally strong arguments on behalf of maintaining a corporate memory of business and government. In an article in The American Archivist entitled "Modern Records Management" Leahy declared that "Any destruction of records must provide maximum insurance that the essential core of recorded experience in the fraction of modern records is preserved."
In 1963 Leahy and Christopher Cameron co-authored a book on Modern Records Management. The concluding chapter of the book includes a discussion of "What Is Worthy of Permanent Preservation?" Two categories of business records, they wrote, merit permanent preservation. One category of permanent business records is evidence of corporate and individual rights. The second category of permanent business records "shed light of historical interest on the organization, functioning, and accomplishments of the company."
The defining characteristic of the records management legacy of Emmet J. Leahy is his ability to identify opportunities that technology brings to records management. In 1960, four years before his death, Leahy concluded an article entitled "Don't Keep It - Throw It Away" with a brief discussion of continuing improvement in records management. Closed circuit television opens up a whole new area of quick reference. Before long a records storage area will be piped right into headquarters office so that management and personnel will be able to view and discuss with the archives clerk any document in the files.
If Leahy had lived until the 1980s he would have discerned the impact of computer technology on records management and he would have led records management into new responsibilities and opportunities.
Leahy's career in records management ended on June 23, 1964 when he died a day after suffering a stroke but his records management legacy is being perpetuated through the Emmett J. Leahy annual award for outstanding contributions to information and records management.