Hans Rosling was a Swedish physician, statistician, and public speaker who was best known for his innovative use of data visualization to explore and explain global health and development issues. He was a professor of international health at the Karolinska Institute in Stockholm, Sweden, and co-founder and chairman of the Gapminder Foundation, which developed the Trendalyzer software system. Rosling was a passionate advocate for the use of data to inform decision-making and to improve the lives of people around the world. He was a frequent speaker at TED conferences, and his 2006 TED talk, "The Best Stats You've Ever Seen," has been viewed more than 10 million times. He was also the author of several books, including Factfulness: Ten Reasons We're Wrong About the World—and Why Things Are Better Than You Think. Rosling was a tireless advocate for global health and development, and his work has had a lasting impact on the way we think about and use data to understand the world. He was a passionate believer in the power of data to make the world a better place, and his legacy will continue to inspire and inform generations to come.