{"nrhp_refnum":"75000295","name":"Birkhoff, George D., House","other_names":[],"category":"building","location":{"address":"22 Craigie","address_restricted":false,"city":"Cambridge","county":"Middlesex County","state":"MA","lat":42.37818525400007,"lon":-71.12861428145283,"geom_source":"nps_gis"},"listed_date":"1975-05-15","is_nhl":true,"nhl_designated_date":"1975-05-15","areas_of_significance":["Science"],"significance_levels":["national"],"summary":{"what_it_is":"A three-story frame house at 22 Craigie Street in Cambridge, Massachusetts, reportedly built in the 1890s, though the form suggests it may be earlier. The architect is unknown.","why_significant":"The house is significant as the home of mathematician George D. Birkhoff, who lived there from 1920 to 1928. The nomination describes him as the leading native American mathematician of his generation. His solution of Poincare's \"last theorem\" and his ergodic theorem are cited as achievements that showed American science had come of age on the world scene.","narrative":"This three-story frame house at 22 Craigie Street in Cambridge, Massachusetts, was reportedly built in the 1890s, although the style and neighboring houses suggest an earlier date. Its architect is unknown, and its French Revival design is described as popular for the period. The exterior remains intact. Inside, a central hall plan has been modified by turning a first-floor parlor into a cathedral-ceiling living area and by adding a modern kitchen and a bath. The house is listed for its association with George D. Birkhoff, who lived there from 1920 to 1928 while teaching at Harvard. Colleagues described Birkhoff as the leading native American mathematician of his generation. He solved a theorem that Henri Poincare had posed but never answered, and he developed his own ergodic theorem, which addressed a long-standing problem in gas theory and statistical mechanics. His work is presented as evidence that American science had come of age internationally by the early twentieth century.","period_of_significance":"1900-","architect_builder":null,"architectural_style":"French Revival","criteria":[],"status_note":"Listed in excellent condition and occupied as a private residence. The exterior is intact, and the interior has a converted first-floor parlor, a modern kitchen and an added bath.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:11:54.943022-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/73/7937/63793773/content/electronic-records/rg-079/NPS_MA/75000295_NHL.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/75000295/946e721015-800.webp","url_1600":"https://nationalhistoricalregister.com/media/75000295/946e721015-1600.webp","licence":"CC BY-SA 3.0","author":"Tim Pierce","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:George_D_Birkhoff_House_Cambridge_MA.jpg\" rel=\"noopener\">Tim Pierce</a>, <a href=\"https://creativecommons.org/licenses/by-sa/3.0\" rel=\"license noopener\">CC BY-SA 3.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:George_D_Birkhoff_House_Cambridge_MA.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/63793773","wikipedia":"https://en.wikipedia.org/wiki/George_D._Birkhoff_House","wikidata":"https://www.wikidata.org/wiki/Q5538300"},"indexable":true,"url":"https://nationalhistoricalregister.com/massachusetts/middlesex-county/birkhoff-george-d-house-75000295/"}