Chiefs of staff from around the world have shared their experiences of working with the most powerful people in politics.
They are often the second-most powerful individuals in the room where major political decisions are made, yet remain largely unknown to the general public.
"The (chief of staff) role has this professional intimacy, it's such a unique role and the biggest takeaway was that at the end of the day it does come back to friendship,"
Phoebe Saintilan-Stocks, author of The Right Hand, notes that trust and loyalty are essential components of the chief of staff role.
Author's summary: Chiefs of staff share their unique experiences working with powerful leaders.