8
. Einstein to Betty Neumann, Nov. 5 and 13, 1923. These letters are part of a set given to Hebrew University and are not catalogued in the Einstein archives.
9
. Einstein to Betty Neumann, Jan. 11, 1924; Pais 1982, 320.
10
. Einstein to Elsa Einstein, Aug. 14, 1924, part of sealed correspondence released in 2006; Einstein to Betty Neumann, Aug. 24, 1924. I am grateful to Ze’ev Rosenkranz of the Einstein archives in Jerusalem and Caltech for helping me find and translate these letters.
11
. Einstein to Ethel Michanowski, May 16 and 24, 1931, in private collection.
12
. Einstein to Elsa Einstein and Einstein to Margot Einstein, May 1931, part of sealed correspondence released in 2006. I am grateful for the help of Ze’ev Rosenkranz of the Einstein Papers Project for providing context and translation.
13
. Einstein to Margot Einstein, May 1931, sealed correspondence released in 2006.
14
. This is a sentiment that lasted through his life. Einstein to Eugenia Anderman, June 2, 1953, AEA 59-097: “You must be aware that most men (and many women) are by nature not monogamous. This nature is asserted more forcefully when tradition stands in the way.”
15
. Folsing, 617; Highfield and Carter, 208; Marianoff, 186. (Note: Folsing spells her name Lenbach, which is not correct according to the Einstein archive copies.)
16
. Elsa Einstein to Hermann Struck, 1929.
17
. George Dyson, “Helen Dukas: Einstein’s Compass,” in Brockman, 85–94 (George Dyson was the son of Freeman Dyson, a physicist at the Institute for Advanced Studies in Princeton, and Dukas worked as his babysitter after Einstein died). See also Abraham Pais, “Eulogy for Helen Dukas,” 1982, American Institute of Physics Library, College Park, Md.
18
. Einstein to Maurice Solovine, Mar. 4, 1930, AEA 21-202.
19
. Einstein to Mileva Mari
, Feb. 23, 1927, AEA 75-742.
20
. Ibid.
21
. Einstein to Hans Albert Einstein, Feb. 2, 1927, AEA 75-738, and Feb. 23, 1927, AEA 75-739.
22
. Highfield and Carter, 227.
23
. Einstein to Eduard Einstein, Dec. 23, 1927, AEA 75-748.
24
. Einstein to Eduard Einstein, July 10, 1929, AEA 75-782.
25
. Eduard Einstein to Einstein, May 1, Dec. 10, 1926. Both are in sealed correspondence folders that were released in 2006 and not catalogued in the archives.
26
. Eduard Einstein to Einstein, Dec. 24, 1935. Also in the sealed correspondence folders released in 2006 and not catalogued in the archives.
27
. Sigmund Freud to Sandor Ferenczi, Jan. 2, 1927. For an analysis of the interwoven influence of Freud and Einstein, see Panek 2004.
28
