David Christian is a historian who has helped found the field of Big History. He has written multiple books on the subject, including my favorite, Origin Story. With Bill Gates, he is co-founder of the Big History Project, which has built free on-line high-school courses in big history. https://www.bighistoryproject.com/ https://bighistory.org/ https://rhyslindmark.substack.com/ https://patreon.com/rhyslindmark