Ernst Zermelo 
Ernst Zermelo – Collected Works/Gesammelte Werke [PDF ebook] 
Volume I/Band I – Set Theory, Miscellanea/Mengenlehre, Varia

Ernst Zermelo: A glance at his life and work.- Ernst Zermelo’s curriculum vitae.- Zermelo 1901.- Zermelo 1904.- Zermelo 1908a.- Zermelo 1908b.- Zermelo 1909a.- Zermelo 1909b.- Zermelo 1913.- Zermelo 1914.- Landau 1917b.- Zermelo s1921.- Zermelo 1927.- D. König 1927b.- Zermelo 1929a.- Zermelo s1929b.- Zermelo 1930a.- Zermelo 1930b.- Zermelo s1930d.- Zermelo s1930e.- Zermelo 1930f.- Zermelo s1931b.- Zermelo s1931c.- Gödel 1931b.- Zermelo s1931d.- Zermelo s1931e.- Zermelo s1931f.- Zermelo s1931g.- Zermelo 1932a.- Zermelo 1932b.- Zermelo 1932c.- Zermelo s1932d.- Zermelo s1933b.- Zermelo 1934.- Zermelo 1935.- Zermelo s1937.- Zermelo s1941.

H.-D. EBBINGHAUS: has worked in mathematical logic, mainly in model theory, during the last years also in the history of set theory. Author of the biography of Zermelo, ‘Zermelo – An Approach to His Life And Work’, http://www.springer.com/978-3-540-49551-2.
CRAIG FRASER: works on the history of analysis and mathematical mechanics, covering the period from the eighteenth to the twentieth centuries. A focus of his research has been the calculus of variations, Zermelo’s first area of mathematical research. He is a corresponding member of the International Academy of the History of Science.
AKIHIRO KANAMORI: works in set theory, the history of set theory, and has written several papers on Zermelo and set theory.