David Fradin
Author of soon to be published Wiley Book: Foundations in the Successful Management of Products and Building Insanely Great Products
#5 Product Manager is CEO of the Product.
The Myths of Product Management
Christina Wodtke
93648
But usually without the authority. I argue the product manager (who has been around since 1931 by the way) ask for the authority as I discuss how to do it here: http://spicecatalyst.com/quit-whining-ask-for-the-authority/