Isn’t lashon hara to publicly state that a rabbi prostlytizes? Mods, what could justify your decision to let that comment through? Do you really want to cast doubt on the validity of the gerus of all the people who have been converted with him as a mentor? Please delete it.
Charles, why were you rejected? Some people are rejected for valid reasons — not living in a Jewish community, married to a non-Jew who won’t convert, not willing to become completely observant, etc. But normally someone who studies intensely for five years and lives in an observant community should normally be able to convert. It’s possible that some rabbis or batei din are just too stringent or unwelcoming. The Torah commands us repeatedly to love gerim and not to oppress gerim, probably because a certain number of people have a tendency to do otherwise!
RebDoniel, where is it written that we are obligated to bring close those with Jewish roots or a non-Orthodox Jewish identity? I know some people believe this (maybe Tiferes Bas Yisroel) but what is the source? Anyway, though, you’re right that the obligation to dissuade a convert is pretty minimal — just explain anti-Semitism, the punishments for aveiras, etc.