Nonny Hogrogian is an American author/illustrator who has won the Caldecott Award twice, once for her very first book, Always Room For One More and secondly for One Fine Day, a retelling of an Armenian tale.
Peter Carey is an Australian novelist, best known for his adult novels which have won many awards. He has won the Booker Prize twice and the Miles Franklin Award three times, but he has written a children's novel, The Big Bazoohley, a story about nine year old pyjama-clad Sam who is locked out of the hotel room he is staying in with his parents. This story is such a success with children that it is a shame Carey hasn't written more for children in the way Tim Winton has.
Interestingly, Carey lives in New York and teaches at Hunter College and Nonny Hogrogian, who was born in New York is a graduate of Hunter College!