page_title: John Williams Calkin
hierarchical_section_title: John Williams Calkin
caption_attribution_description: John W. Calkin Los Alamos wartime security badge.
context_page_description: John "Jack" Williams Calkin was an American mathematician, specializing in functional analysis. The Calkin algebra is named after him.
context_section_description: John "Jack" Williams Calkin (11 October 1909, New Rochelle, New York – 5 August 1964, Westhampton, New York) was an American mathematician, specializing in functional analysis. The Calkin algebra is named after him.
caption: Photo from Calkin's identification badge at Los Alamos.
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