Chiefs of staff around the world have shared their experiences of being at the center of big political decisions.
They are often the second-most powerful people in the rooms where major decisions are made, yet most voters are unaware of them.
"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 core to the role, and once lost, it's impossible to continue working together.
Author's summary: Chiefs of staff share insights into their roles.