Military Service, United States Army, 1917-1919; Principal, Jay Dewey Harnish, Architect, Ontario, CA, 1941-1960; Partner, Harnish, Morgan and Causey, Incorporated, Architects, (now known as HMC Architects), Ontario, CA, 1960-1978; following Jay Dewey Harnish's retirement in 1978, the firm changed its name to HMC Architects. HMC Architects is still in operation in Ontario, CA.

Harnish joined the American Institute of Architects in 1943. In 1962, Causey reported being a Registered Architect in the State of California.

Fellow, American Institute of Architects (FAIA).

A.B., University of California, Berkeley, 1924;

Born in Pennsylvania, Harnish died in Ontario, San Bernardino County, CA, at the age of 93.

His mother's maiden name was Herr.

SSN: 549-52-5406; President, Ontario Chamber of Commerce, Ontario, CA, 1941;

• Lancaster, PA (Architect's Birth)
  Lancaster, PA

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• Ontario, CA (Architect's Death)
  Ontario, CA

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