This collection primarily consists of writings, correspondence, and family photographs of the Bransten and Rothmann families. These include the writings and correspondence of Frances Bransten Rothmann and correspondence of her son, John Rothmann. There are also materials related to MJB Coffee Company, family trees, and materials related to the Haas-Lilienthal house and the Bransten house in San Francisco.

Frances Bransten Rothmann was born in 1914 to Edward Brandenstein (b. 1870-d. 1948) and Florine (Haas) Brandenstein (b. 1881-d. 1973). Brandenstein was later changed to Bransten. Edward worked for his brother's company, MJB Coffee Company and Florine was the daughter of William Haas, a prominent businessman in San Francisco. Frances grew up in San Francisco and attended Scripps College and Barnard College. While in New York she met and went on to marry Hans Rothmann, a physician originally from Germany, in 1938. They had three children, William, Susan, and John. Their son, John F. Rothmann donated this collection to the Magnes Museum. He is a radio host on KGO in San Francisco and is a lecturer on American politics.

15 linear feet (10 cartons, 2 boxes, 1 oversize box, 2 oversize folders, 1 volume)

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The collection is open for research with the exception of Volume 1. Volume 1 is restricted until 2041.