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National Museum of Nuclear Science & History

Arnold “Ace” Grubbe

EngineerOak Ridge, TN

K-25 Plant
Manhattan Project Veteran
The K-25 Plant in Oak Ridge, Tennessee

Arnold Grubbe (1904-2002) was an engineer working for the civilian contractor Crane Company in Oak Ridge, Tennessee. He specialized in mechanical engineering, specifically working on valves for the gaseous diffusion process at the K-25 Plant. Following the war, Grubbe stayed with the Crane Company, and after over forty years with the company, he retired in 1969.

Arnold “Ace” Grubbe’s Timeline
1904 Jul 14th Born in Chicago, Illinois

1943 Began work at Oak Ridge, Tennessee, specializing on the valves needed for the gaseous diffusion process.

1969 Retired after forty years with the Crane Company

2002 Died in New Glarus, Wisconsin

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Charles R. McKinney

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The following are excerpts from “Converging Lines,” a genealogy and family history book researched and written by Norma McKinney, as well as oral recollections from her in 2011 and Charles’ remembrances to his grandson in 1990 for an eighth grade report.