Who is Grant Porter from Memoirs of a Teenage Amnesiac and what is their importance?

Grant Porter is Naomi's adopted father. When he was married to Naomi's mother, he was the photographer for the coffee table wine books the couple wrote and published. Now, Grant writes different kinds of books. Right after the divorce, he wrote a memoir of overcoming the divorce and how it links to current events in the world. He also loves to make lists. Naomi has been living with her father since the divorce and it's her father that she goes home with from the hospital when she is released.