However, due to his numerous commitments, both national and international, he can no longer lecture full time, but he holds a visiting professor role.Between the '70s and the '80s, he has undertaken the "Anabasi" expeditions for the reconstruction of the itenarary of the Ten Thousand's retreat. This expedition covered a total of 18,000km and 2,000 photographs being taken.
He undertook and led numerous other expeditions, such as: Lavinium, Forum Gallorum and Forte Urbano in Italy, Túcume (Peru), Har Karkom and others overseas.
He has also held a series of conferences and seminars at the University of Oxford, University of California, National University of Canberra, Universidad de Antiochia, Universidad de Bilbao, Universidad Internacional Menendez Pelayo in Tenerfide and many others.
He has published many academic essays and articles and he has written several best-selling novels (amounting to a total of about 8 million copies sold worldwide). He also writes on many newspapers and magazines as a scientific journalist both in Italy (eg, "Il Messaggero", "Panorama", "Archeo", "Focus") and in Spain (Spanish edition of "Focus" and "El Mundo").
His works have also been subject of awards, such as the "Man of the Year" in 1999 at the American Biographical Institute in North Carolina, "Corrado Alvaro Rhegium Julii" in 2003, "Hemingway" in 2004 and "Bancarella" in 2008.
His The Last Legion novel has only been the basis for the movie, bearing the same title, released in 2007 and starring actors such as Colin Firth, Ben Kingsley and others, and his Alexander Trilogy has been bought by Universal Pictures for yet another cinematic rendition of the story of Alexander the Great.
He also written the screenplays for Marco d'Aviano and Gilgamesh and he has adapted Le Memorie di Adriano for cinema screening. Furthermore, he has hosted the television series Stargate - linea di confine for three seasons already on the Italian TV channel LA7 and he will also host Impero (Empire) on the very same channel.