L’opera scientifica di Ettore Majorana: cenni

This article celebrates the 100th anniversary of the birth of the Italian theoretical physicist Ettore Majorana, probably the brightest Italian theoretician of the XX century. We outline the significance of some of his publications and we recall his life through letters, documents, testimonies discovered or collected by the author during almost 30 years. Finally, we offer information and comments on some unpublished Majorana manuscripts. [Obs.: Much of this material is protected by copyright, and cannot be reproduced without the written permission of the author and of the other holders of the relevant rights].