Marozzi studied at Cambridge University, where he gained a Starred Double First in History in 1993. He has also earned degrees in broadcast journalism from Cardiff University and in international relations from the University of Pennsylvania as a Thouron Scholar. As a journalist, he worked for the BBC, the Financial Times and the Economist.
Marozzi has published five books. South from Barbary (2001) is an account of his explorations through the Libyan Sahara. Tamerlane: Sword of Islam, Conqueror of the World (2004) was a highly regarded biography of the Mongol conqueror Timur and was listed as a Sunday Telegraph Book of the Year.
Faces of Exploration (2006), an account of famous explorers, was followed by The Man Who Invented History: Travels with Herodotus (2008), a biography of the world's first historian, and Baghdad: City of Peace, City of Blood (2014).
Marozzi was a Fellow of the Royal Geographical Society.