He works among others with The New York Times, L’Espresso, The Guardian and NGOs such as Doctors of the World and International Organization for Migration. Grassani’s work has been exhibited internationally and awarded at Premio Internacional de Fotografia Humanitaria Luis Valtueña, Sony World Photography Awards, Days Japan International Awards, PX3 International Awards, Marco Luchetta International Award, Premio Amilcare Ponchielli, Memorial Mario Giacomelli and FNAC contest. In September 2013, he held a conference in Berlin for TEDx Berlin about his photographic project “Environmental migrants: the last illusion”.