Life Extension Institute
The Life Extension Institute (LEI) was created in 1913 in New York as a life extension company that offered medical examinations and published health literature. It was founded by Yale professor Irving Fisher and builder Harold Ley, and its officers have included former American president William Taft, inventor Alexander Graham Bell, and physician William James Mayo. Its medical examinations have been offered at least until 1995, and a New York company of the same name has existed as late as 2017.
- Hirshbein, LD (Spring 1999). "Masculinity, Work, and the Fountain of Youth: Irving Fisher and the Life Extension Institute, 1914-31". Canadian Bulletin of Medical History. 16(1): 89–124. "In 1914, Progressive Era reformer Irving Fisher and wealthy contractor Harold Ley founded the Life Extension Institute (LEI), a business venture organized to address the problems of American health. For approximately two decades, from 1914 until the death of its medical director in 1931, the Life Extension Institute widely promoted its health maintenance program of annual physical examinations and health literature."
- "Medicine: Life Extension". Time. 22 April 1935. Retrieved 12 June 2018. "In 1913 Professor Irving Fisher of Yale, 46, was receptive to a good business enterprise. A 41-year-old Manhattan contractor & builder named Harold Alexander Ley had an inviting idea. The shrewd, vigorous pair conferred, organized the Life Extension Institute with $150,000 capital. [...] Purpose of the Life Extension Institute was to give thoroughgoing medical examinations [...]"
- "The Life Extension Institute". The New York Times. 31 December 1913. Retrieved 12 June 2018. "The principle of the Life Extension Institute incorporated on Monday is the the simple early discovery of slight physical 'impairments' will induce men to consult their doctors before it is too late. Ex-President Taft, in become the Chair of the board of founders, and Mr. E. F. Rittenhouse, in assuming the Presidency of the institute, have based this principle on the work of prevention already done by life insurance companies in reducing the death rate and extending human life."
- Fisher, Irving; Fisk, Eugene (October 1915). How to Live: Rules for Healthful Living Based on Modern Science. Funk & Wagnalls Company.
- "2017 Annual Report for LIFE EXTENSION INSTITUTE, INC.". Commonwealth of Virginia State Corporation Commission. Retrieved 12 June 2018.
- New York Magazine. Vol 28, No 7: p 23. 13 February 1995.