He began his academic career as a Dante scholar, publishing
The Body of Beatrice in 1988. His work quickly expanded to concern itself broadly with the Western literary and philosophical tradition, focusing on the human place in nature and what he calls "the humic foundations" of human culture. In 1992, he published
Forests: The Shadow of Civilization, a wide-ranging history of the religious, mythological, literary, and philosophical role of forests in the Western imagination. In 2003, he published
The Dominion of the Dead, in which he probes the relations the living have maintained with the dead in a number of secular domains, among them burial places, houses, testaments, images, dreams, and political institutions. In his book
Gardens: An Essay on the Human Condition (2008), Harrison focused on the role that care and cultivation play in human culture, arguing that gardens embody "the vocation of care" that defines the inner core of our humanity. He has also contributed to the
Financial Times, reviewing an English-language translation of Giacomo Leopardi's
Zibaldone. His most recent monograph,
Juvenescence: A Cultural History of Our Age (2014), examines the modern obsession with youth and its broader cultural consequences. Together, these works demonstrate Harrison’s distinctive blending of literary analysis, philosophical reflection, and
cultural criticism, and they have been widely translated and discussed across disciplines. == Themes and influence ==