Stephan Klasen is considered one of the most distinguished scholars on gender economics in the 21st century. Over the past 25 years, he has tirelessly worked to understand the complex phenomena of gender inequality: From counting the number of missing women in the world and shedding light on why women go missing, to showing that leaving girls out of school not only deprives them, but also robs society of the opportunity to thrive on the talents of its entire population; from understanding why equal rights and rising incomes everywhere have not resulted in women participating more at work, to measuring gender inequality in its various dimensions. This volume, a collection of some of Stephan Klasen’s most important writings on the topic of gender inequality, honours his academic life and gives the reader an in-depth insight into both what we know and don’t (yet) know about the economics of gender inequality.