If you only know Ray Franz, then he is easily the most effective apostate ever, to you.
I never joined the Church of Franz because I left the Watchtower before he did, not only date-wise but I left at an earlier age than he did.
I have had the good fortune to have "met" many apostates, some while they were alive and others only through their writings, whether they were alive or dead at the time I came to know them. Some I know better - more thoroughly - than others.
Each of apostates I mention has contributed something to the XJW community, E UNUM PLURIBUS.