Today I uploaded this article:

" Zamenhof and Esperanto" by Norman Berdichevsky (1986)

. . . summarizing Zamenhof's life and work, with special attention to his relationship to Yiddish, Hebrew, Zionism, Hillelism/Homanaranismo (his religious creation, comparable to Ethical Culture), and Jewish affairs and history generally.

Note this article which recently appeared:

"L.L. Zamenhof and the Shadow People"
The amazing story of how Esperanto came to be.
by Esther Schor
The New Republic
December 30, 2009
http://www.tnr.com/article/books-and-arts/ll-zamenhof-and-the-shadow-people

Dr. Schor's recent presentation at the UN seems to be identical, but if you prefer a video format:

Zamenhof and the Shadow People: video of presentation by Esther Schor, Zamenhof Symposium (15 December 2009).

Note: an emphasis on the Jewish dimension of Zamenhof, which has garnered much more attention in the Esperanto world since the 1970s, is fairly recent in introductions to Zamenhof in English. This is an important piece of intellectual and social history, so I applaud this development. Here is an old article from 1905:

‘"Esperanto and Its Originator: How a Jew Came to Create a "Universal Language"’ by Isidore Harris