Ken Langdon has a background in sales and marketing in the technology industry. As an independent consultant he has trained salespeople and sales managers in the USA, Europe and Australia and has advised managers on the coaching and appraisal of their staff. He has also provided strategic guidance for companies including computer major Hewlett Packard. Ken is author of a number of books for DK and co-author of several Essential Managers titles, including Putting Customers First. He is also one of the authors of DK's Successful Manager's Handbook.