Conor McGregor is the subject of a new biography just released in France."Conor McGregor: Obsessions" is written by Irish-based French journalist Charles Thiallier, who has previously reported on McGregor for L'Equipe.On the eve of the announcement of McGregor's third retirement, Thallier has been speaking to Will Downing about how the project came about, the many interviews performed for the book, and what picture emerges of the man himself.