Chiefs of staff from around the world share their experiences of being at the center of big political decisions.
They are often the second-most powerful people in the room, but remain largely unknown to voters.
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.
In the book "The Right Hand" by Phoebe Saintilan-Stocks, eight chiefs of staff offer insights into their roles supporting and challenging the world's most powerful leaders.
Saintilan-Stocks notes that trust and loyalty are core to the chief of staff role, and once these are gone, the working relationship cannot continue.
Chiefs of staff are notoriously media-shy, preferring to stay out of the news.
Insights into the lives of chiefs of staff revealed in new book.