ˌWho’s ˈWho BrE AmE
trademark a book produced every year in the UK that contains an ↑ alphabetical list of famous and important people, such as politicians, writers, and entertainers, and provides information about their achievements, their families etc. If a list of people ‘reads like a Who’s Who’ of something, it means that it contains a lot of famous people:
The list of guests read like a Who’s Who of the pop industry.