This is awesome. I'm totally preordering the book. Dr. Adam Grant reminded me of my mentor Irene Vlachos-Weber, who is one of the top 10 highest rated professors on ratemyprofessors.com. She is completely accessible for her students and she is ultra popular. During her office hours, there is normally a cohort of 6 or so people waiting outside - current and former students. She has her office hours posted on her door and she holds them for around 6-8 hours per week.
She finds lost souls who need to finish their senior capstone in psychology, normally suffered through by working in a psych lab, and gives them a senior capstone by reading books (which, for me, was total heaven). When a huge chunk of psychology seniors couldn't graduate, she taught a summer class which was a summer reading capstone. It was phenomenal.
She is one of the best people ever and probably the best networked person I know outside of the business school. And it's all due to how insanely helpful she is. For example, she is one of my references.