"The book under review is a collection of selected papers by Ennio De Giorgi (1928-1996). . The book has been very carefully prepared and printed. It is a valuable source for all interested in the work of De Giorgi. It presents the broad range of his achievements and his entire intellectual path, as a problem solver and as a proponent of deep and ambitious mathematical theories." (Roman Murawski, Zentrablatt MATH, Vol. 1096 (22), 2006)

"This volume contains a well-balanced choice of papers written by Ennio De Giorgi, an outstanding Italian mathematician of the 20th century. . In my opinion the volume, which covers all the main directions of the author's activities (measure theory, the 19th Hilbert problem, minimal hypersurfaces, G- and D-convergence, and foundations of mathematics) should be on the shelves of every mathematical library." (EMS Newsletter, December 2006)