Did Daniel write all the chapters in the book of Daniel?

Although the entire book is traditionally ascribed to Daniel the seer, chapters 1-6 are in the voice of an anonymous narrator, except for chapter 4 which is in the form of a letter from king Nebuchadnezzar; only the second half (chapters 7-12) is presented by Daniel himself, introduced by the anonymous narrator in chapters 7 and 10.[16] The real author/editor of Daniel was probably an educated Jew, knowledgeable in Greek learning, and of high standing in his own community. The book is a product of "Wisdom" circles, but the type of wisdom is mantic (the discovery of heavenly secrets from earthly signs) rather than the wisdom of learning - the main source of wisdom in Daniel is God's revelation.[