Jesper Roine is an expert on wealth and income inequality, as well as one of the researchers who has contributed to the World Top Incomes Database upon which Piketty’s research is based. He is an associate professor of Economics at SITE at the Stockholm School of Economics and has been published, extensively, on the topic of income and wealth inequality. Together with his colleague Daniel Waldenström at Uppsala University, he is responsible for the Swedish data on long-run income and wealth inequality used in Thomas Piketty’s Capital in the Twenty-First Century.