Gage launched his recent book, Gold Camp Gentleman: A Life of James D. Hague, in March 2025 at historic North Star House in Grass Valley. He has written nine books about the social, economic and cultural histories of California mining settlements at New Almaden and in the Northern Mines region of the Sierra, including Nevada, Sierra, Plumas and Placer counties.

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   Gage was raised in a family business, was a purchasing manager for Ingersol Rand and retired after 25 years with Lockheed Martin Corporation. He has received the Phelan Award and grants from the California Council for the Humanities, the Mining History Association and The Book Club of California. His work has been recognized with awards in California and Cornwall, England, where he was made a Cornish bard in 1998. In 2019, he won the John Townley Award from the Mining History Association for his article "Order L-298: The Closing of America's Gold Mines in World War II."

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   Gage often speaks to library associations, service clubs and churches. He has keynoted events in Mineral Point, Wisconsin and Pencoys,Cornwall. He teaches a four-week course on Cornish History and Culture in the Osher Life Long Learning Institute at Sierra College in Grass Valley.

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   For 30 years Gage’s writing career was linked to his publisher and mentor, David A. Comstock. He continues to write for Comstock Bonanza Press and publisher Cindi Anderson.

​Gage lives in Grass Valley with his wife, Ilka Weber. He is past president of the California Cornish Cousins and a licensed lay preacher at St. Thomas Episcopal Church, Sunnyvale and Emmanuel Episcopal Church, Grass Valley.