I have sometimes heard the name George Soros thrown around as a possible financier of different Esperanto projects. Is this only done as a joke, or does he actually have some involvement with Esperanto?
The father of George Soros, Tivadar Soros (in Esperanto: Teodoro Ŝvarc), was an active Esperanto speaker and writer. George learned Esperanto in his home as a child, but not as a native language. George used Esperanto in order to leave Hungary in 1947: He first participated in the Universala Kongreso in Switzerland, and then continued to Britain instead of returning to Hungary. After that, George stopped using Esperanto, and he is unfortunately not financing any Esperanto projects.
His father was an Esperantist and, apparently, taught his son Esperanto during his childhood. Soros is often given as an example of native Esperanto speaker, although I am not 100% convinced it is true (if someone knows a source about this claim, I'd be glad to see it). Even if it is, Soros is not involved with Esperanto today. If you heard someone proposing that George Soros finance Esperanto activities, it was probably a joke.
Also, see this interview with Humphrey Tonkin about George Soros and Esperanto: