louis-christophe zaleski-zamenhof (born ludwik krzysztof zamenhof, 23 january 1925 – 9 october 2019) was a polish-french civil and marine engineer of jewish descent. he worked in the design of structural steel and concrete construction. zaleski-zamenhof wrote a foreword to "l'homme qui a défié babel" ("the man who defied babel", 2003), a french-language biography, by rené centassi and henri masson, of the originator of esperanto.