National Museum of Nuclear Science & History
McGruder worked for Stone and Webster Engineering Corporation.
Horace Mahorney was a chemical engineer at the Y-12 plant in Oak Ridge, Tennessee. From September 1943 to November 1945, Mahorney was an operator of the mass spectrometer with Dr.
Clarence Johnson (1912-2012) was a Canadian-born chemical engineer. He was born in Alberta, Canada on November 24, 1912 to Swedish migrant parents.
