D O C U M E N T 5 1 1 O N A U R E L S T O D O L A 7 2 5        Published in Neue Zürcher Zeitung, 12 May 1929, [1]. A manuscript ([7 108)] is also available. [1] Einstein was requested by Heinrich Zangger to write a congratulatory essay for A. Stodola’s sev- entieth birthday, to be published in the newspaper (see Abs. 1059). Einstein had already contributed a scientific paper to a Festschrift in honor of Stodola (see Einstein 1929g, Doc. 313). He found it dif- ficult to compose a more personal article and requested help from Michele Besso (see Doc. 512). Zangger also provided additional details in order to assist (see Doc. 499). [2] Einstein began lecturing at the ETH in 1909. On his first meeting with Stodola, see his letter to Michele Besso, 17 November 1909 (Vol. 5, Doc. 187). [3] Helene Anna Stodola and Olga Stodola (1891–?). [4] Zangger sent Einstein the obituary Stodola had written for his daughter Helene, Stodola 1929 (Doc. 499). [5] Michele Besso is the author of this section, and he proposed that it be published anonymously at the end of Einstein’s essay (see Doc. 516). [5] [4]