Online there is an attempt at an English translation of
the Francois Mattei biography;
I think a chapter or two may be missing, but most of the book is represented.

This English translation is a mystery to me, by the way.
I have no information about the translator,
or the website that hosts the pages.
The question of how legal this is, is a good question,
and I do not know the answers.

Table of Contents: Because We Are Gypsies