The very first interview I read, and connected with, was with Carol Chu as the art director of the children's trade division at Houghton Mifflin Harcourt:
*Interview with Carol Chu*
Some highlights that I found especially useful:
On keeping your focus and going after your goals: "At every fork in the road, I took the path which eventually led me here."
What she looks for when viewing illustrator submissions: "The portfolios which get passed around have a distinct voice/vision and we send them around to everyone in the design department. I would rather see a portfolio with a strong point of view which might not be right for a lot of books than a middle-of-the-road functionally competent portfolio which can be forgettable and generic."
On whether she prefers working with established pros or new talent: "I care about meeting deadlines and clear communication between me and the illustrator... I prefer working with someone whose QUALITY is consistent."