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Jonathan O'Brien is the CEO of the international procurement training, consultancy and platforms provider, Positive Purchasing. With over 30 years' experience working in purchasing, he has worked all over the world to help global organizations increase their purchasing capability through training, education and working directly with practitioners and executive teams to drive in the adoption of category management and other strategic purchasing methodologies. He is also the author of Category Management in Purchasing, Supplier Relationship Management, Negotiation for Procurement and Supply Chain Professionals, The Buyer's Toolkit and Sustainable Procurement, all published by Kogan Page.