Katherine Frisk is or was an enigma. We know that the amazing world-changing book, Jesus Was A Palestinian, was authored by a "Katherine Frisk" but there is NO other information on "Katherine Frisk". We don't even have an active email for her.
Many say that Katherine was Catherine "Kate" Frisk who was born in Malta in 1933 and lived in the USA where she passed away in 2018. But that's NOT confirmed.
It may be that "Katherine Frisk" is a nom-de-plume. Considering the subject matter in our book, it would NOT be a stretch to imagine that some would take offense to her truth-telling and so going full anonymous would make survival sense. We simply don't know. And so we cannot 100% confirm her identity.
What we do know is that Katherine submitted over 50 articles to VT and wrote a great book. That all stopped in 2018. VT periodically does a few re-publishes of her work.