Winston is the sire of Mai.
He lived with her in New Orleans, and prior to that, New York. As far as Mai knows, he's from France.
His art is poetry and he's gone under many pen names, and as far as Mai knows, gained many fans. One of those is Qasi who was originally Winston's ghoul and is now Mai's ghoul. He's currently working on a poem about how the snake was let into the nest or something like that.
He was involved in the Blood Disease plot to the best of our knowledge, but never speaks of it. It's assumed he has had the same experience Mai has, as evidenced by his apparent petrifying fear of Marcellus.
He is currently the Keeper of Elysium in Detroit.