Although he reputedly hated the label of 'guru', Peter Drucker was, by any standards, the greatest management guru the world has yet seen. In 1996, the McKinsey Quarterly journal described him as the 'the one guru to whom other gurus kowtow' and Robert Heller described him as 'the greatest man in the history of management', praise indeed for a man who described himself as 'just an old journalist'.

Robert Heller and Alistair Schofield (2006) "Peter J Drucker (1909~2005)" on extensor.co.uk