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John Warner

Senior Partner, Cleveland
John leads McKinsey’s work in energy and materials in the Americas, and our Global Chemicals and Agriculture Practice.

About John

Having spent over 25 years with the firm, John currently leads the energy and materials work and Chemicals and Agriculture Practices globally. In addition, he is a member of the firm’s Senior Partner Review Committee and the Americas senior leadership team.

John focuses his client efforts on fundamentally improving the performance trajectory of leading-edge companies. Specific areas include corporate strategy and finance, marketing and sales, operations, organization-efficiency effectiveness, and change management.

John has a passion for Ohio and has led many high-impact initiatives with the business community on economic development, healthcare, and education. He is currently chairman of the Ohio Business Roundtable.

Prior to McKinsey, John was a financial analyst at a multinational conglomerate, where he was a graduate of the company’s financial-management program. In addition to his MBA, John has a general course degree from the London School of Economics.

Past experience

General Electric
Financial analyst


Harvard Business School

College of William & Mary
BA, economics