Arthur Cotterell, former Principal of Kingston College in London, has spent many years combining senior educational management with historical research. He is the respected author of more than thirty books, and is now writing on the Chinese empire, from the history of which he considers one can learn as much about leadership as from Ashridge or Harvard.
Interesting overview especially in terms of civilizations of Mesopotamia (Sumerer, Asyrian). Also in terms of comparision, time tables and so on. But there is to many summaries of history events of concrete countries and insufficient generalizations. Pretty hard to read.