Through James's wife Dorothy, Weizmann was to meet Rózsika Rothschild, who introduced him to the English branch of the family – in particular her husband Charles and his older brother Walter, a zoologist and former member of parliament (MP).
Melalui istri James, Dorothy, Weizmann bertemu dengan Rózsika Rothschild, yang mengenalkannya dengan cabang Inggris dari keluarga tersebut – terutama suaminya Charles dan kakaknya Walter, seorang zoologis dan mantan anggota parlemen.