Alexander the Great, Killer of Men

The general story of Alexander is well known. After taking over from his dead father at the age of sixteen he gained control of first the rest of Greece, they he defeated the Persian empire on his way to Northern India. The author is Lecturer in Strategic Studies at the University of Reading, England. He brings an insight to Alexander's battles that is lacking in similar reports from other writers. He is able to look at Alexanders contributions to combined arms operations, to the effective use of non-Greek forces, the use of a navy when required. During the twelve years Alexander campaigned he fought a wide variety of enemies from fortified cities, calvary, various kinds of infantry with varying combat styles. Alexander was successful against them all. What made him the most successful general of all time?