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Jonathan O'Brien is the CEO of Positive Purchasing Ltd. With over 30 years experience in purchasing, he has worked all over the world to help global organizations increase their negotiation and purchasing capability through digital platforms and tools, high-impact training, education and working directly with practitioners and executive teams to drive in the adoption of strategic purchasing methodologies. He is the author of Category Management in Purchasing, Supplier Relationship Management, Negotiation for Procurement & Supply Chain Professionals, The Buyer's Toolkit and most recently, Sustainable Procurement, all published by Kogan Page.