He listens without judgment. People tell him their regrets, their hidden dreams, their grief. He truly _sees_ them and gently helps them - sometimes with wise words, sometimes with discreet financial help from his own considerable wealth.
Along the way he becomes best friends with the artist himself, Asher Glissen.
*Who is Theo really? (Spoiler)*
We learn Theo has known great loss - he lost his daughter. And he is hiding his true identity.
His full name is *Gamez Theophilus Zilavez*, known in the international art world as *Zila* - one of the most famous, reclusive artists of his generation. He came to Golden to live in anonymity.
At the end of the book, Theo dies in a tragic accident - he falls from his balcony while trying to stop an attack on two of his friends.
Only after his death is his identity as Zila revealed. He leaves a final letter revealing that Asher Glissen, the portrait artist, is actually his biological son, and leaves his entire art estate to him.