Marjorie Lucile Antoine Garn was born on August 31, 1923. She moved to Los Alamos in 1943, with her husband Wray B. Garn. She worked at the Los Alamos KRSN radio station, and then in the Los Alamos Lab until her retirement.
Garn was also an artist and displayed her artwork in both Los Alamos and White Rock. She was active in the Los Alamos Geological Society and the White Rock Senior Center.