Executive Management

D.G. Macpherson is the Chairman and Chief Executive Officer of W.W. Grainger, Inc.

From 2015 to 2016, D.G. served as Grainger’s Chief Operating Officer, and prior to that, he was Senior Vice President and Group President, Global Supply Chain and International, where he led the development of corporate strategy and continuous improvement, the global supply chain organization, the company’s single channel online business model and international operations in Asia and Europe.

D.G. joined Grainger in 2008 from the Boston Consulting Group (BCG), where, from 2002-2008, he was Partner and Managing Director. In that capacity, he served as a consultant to Grainger on several strategic and operational efforts including availability improvement, pricing strategy, product line expansion and sales force effectiveness.

At BCG, D.G. was a member of the Industrial Goods Leadership Team with strong experience in production systems and continuous improvement methodologies. Early in his career, he was an operations manager for Rain Bird Sprinkler Manufacturing Company and a test engineer with the U.S. Air Force.

D.G. holds a bachelor’s degree from Stanford University and an MBA from Northwestern’s Kellogg School of Management.

D.G. served on the International Paper Company Board of Directors from 2021 to 2024, and currently sits on the Museum of Science and Industry Board of Trustees as well as serving as the Vice Chair of the Civic Committee of the Commercial Club of Chicago.

Nancy Berardinelli-Krantz is the Senior Vice President and Chief Legal Officer of W.W. Grainger, Inc. She oversees the company's corporate affairs organization which includes communications and public affairs, ethics and compliance, environmental social governance (ESG), legal, environmental, health and safety and security and loss prevention teams.  

Nancy is an accomplished leader with extensive legal, ethics and compliance experience and leadership in the Army. She joined Grainger from Eaton Corporation in January 2023, where she was Senior Vice President and Deputy Chief Legal Officer. There she oversaw a global team of attorneys and legal professionals. Prior to Eaton, Nancy served in leadership positions at The Goodyear Tire & Rubber Company and worked for the international law firm of Jones Day. She is also a Veteran of the United States Army, Judge Advocate General's Corps, where she served as a trial attorney in Fort Hood, Texas, and for the Contract Appeals Division in Washington, D.C. She also served as a trial defense counsel in Baghdad, Iraq. 

Nancy earned a bachelor's degree in political science from John Carroll University, and a juris doctorate, magna cum laude, from the Cleveland-Marshall College of Law. 

She currently serves on the board of trustees for The Command Purpose Foundation, an organization serving the next generation of veteran leaders to bridge the gap between military and civilian life. She also serves on the board of trustees for The Cleveland State University Foundation. Nancy is a 2024 Daniel Burnham Fellow, selected by Leadership Greater Chicago, joining top executives in advancing workforce and economic progress through community investments and partnerships. 

Barry Greenhouse is the Senior Vice President, Merchandising, Supplier Management & Marketing of W.W. Grainger, Inc., a $17.9 billion leading broad line distributor with operations primarily in North America and Japan. In this role, he oversees the company’s merchandising capabilities, supplier relationships and product margin, as well as marketing, pricing and mid-sized customer initiatives. Together, these responsibilities enable a differentiated and cohesive value proposition at scale, aligning product, price, promotion and go-to-market execution. 

Since joining Grainger in 2004, Barry has held multiple roles of progressive responsibility, most recently as Senior Vice President, Global Supply Chain and Customer Experience, where he was responsible for all aspects of the customer experience from order to delivery, as well as the overall design and capabilities for Grainger’s industry-leading fulfillment network. His leadership was instrumental during Grainger’s response to the COVID-19 pandemic, ensuring continuity in supply chain operations as an essential business providing critical products to help customers maintain a safe, healthy and productive work environment.

Prior to joining Grainger, Barry held roles in operations, sales, marketing and project management at McMaster-Carr and Webvan. 

Barry earned a bachelor’s degree in biology and an MBA, both from the University of California, Los Angeles.

He serves on the board of Erika’s Lighthouse, an organization dedicated to the prevention, early identification and early intervention of youth mental health issues and the board of FIRST Illinois Robotics, which designs accessible, innovative programs that motivate young people to pursue education and career opportunities in science, technology, engineering and math (STEM). Most recently, Barry served on the board of trustees for Grainger-affiliated MonotaRO, a Japan-based leading eCommerce direct marketer of maintenance, repair and operating (MRO) products. 

Jonny LeRoy is the Senior Vice President and Chief Technology Officer of W.W. Grainger, Inc. He is responsible for the technology systems, security and operations that underpin Grainger’s business model.  

Jonny joined Grainger in 2020 after a 15-year career at ThoughtWorks, where as Head of Technology for North America, he led their technology organization, growing new offerings and capabilities, while also helping to progress their talent, culture and delivery expertise. In prior roles at ThoughtWorks, Jonny served as Market Tech Principal for the West Coast and Lead Developer in the U.S. and UK. Earlier in his career, Jonny was a founder and CTO of a successful UK start-up.  

Jonny holds CPE from Westminster University, and a MA, Literae Humaniores from the University of Oxford. Jonny is a 2022 Daniel Burnham Fellow with Leadership Greater Chicago and is on the governing body of the Evanta Chicago CIO community. He also serves on the Board of Advisors for the Illinois Institute of Technology (IIT) College of Computing.  

Deidra (Dee) Merriwether is the Senior Vice President and Chief Financial Officer of W.W. Grainger, Inc., a $17.9 billion leading broad line distributor with operations primarily in North America and Japan. She oversees the company’s financial activities, including controllership, treasury, financial analysis, investor relations, internal audit, tax and financial operations. She is also responsible for Grainger’s corporate analytics, real estate and indirect procurement. 

Before becoming CFO in 2021, Dee served as Senior Vice President and President, North American Sales and Services, responsible for sales, inventory management solutions and customer engagement strategies in Canada, Latin America and the United States. Since joining Grainger in 2013, she has served in senior leadership positions across pricing, sales, field operations and indirect procurement—delivering customer results and consistent top-quartile performance for the company.  

Dee is an accomplished leader with more than two decades of broad management, operations and financial experience. She started her career as an engineer and production leader at Eli Lilly and gained valuable accounting and M&A experience at PricewaterhouseCoopers. She then held roles of increasing responsibility in general management and finance at Sears Holdings, departing as Chief Operating Officer in 2013. 

Dee earned an MBA in finance and operations management from Indiana University’s Kelley School of Business and a bachelor’s degree in chemical engineering from North Carolina A&T State University. She is also a graduate of the Executive Accounting Program at the University of Texas and a fellow of the CEO Perspectives and CFO Leadership programs at Northwestern’s Kellogg School of Management and the Harvard Business School, respectively.

Dee currently serves on the boards of Weyerhaeuser Company, Ravinia Festival and The Chicago Network, and is vice chair of the North Carolina A&T Aggie Athletic Foundation.

For more information, visit invest.grainger.com. 

Cecelia Myers is the Senior Vice President and Chief Product Officer of W.W. Grainger, Inc., a $17.9 billion leading broadline distributor with operations primarily in North America and Japan. In this role, Cecelia leads technology strategy and priorities across product, UX, and digital analytics. She brings deep experience leading cross-functional teams through digital transformation, including how it impacts technology and operating models, helping product management and user experience design teams effect change in evolving organizations.

Before joining Grainger in 2023, Cecelia was Vice President of Digital at CDW, where she led their digital channel. In this role, she oversaw product management, ePro integrations, demand generation, and product design. During her tenure, she launched CDW’s B2B digital portal, built out the product and design organization, and drove significant digital growth. Prior to CDW, Cecelia was Director of Product & UX at Groupon, where her teams developed merchant and customer support experiences, implemented internal and external AI solutions, and launched Groupon’s photo/video studio. She began her career as a founder-in-residence at venture capital firm Sandbox Industries, later co-founding CakeStyle with their backing, an early online women’s styling e-commerce business.

Cecelia holds a master’s degree in product design & development from Northwestern’s McCormick School of Engineering and a bachelor’s degree in literature from Indiana University. She is actively involved with the Lymphoma Research Foundation and serves as a Mentor Angel with Imerman Angels. 

Rob Reynolds is the Senior Vice President, Branch and Distribution Center (DC) Operations, of W.W. Grainger, Inc. His geographically dispersed organization includes team members working at more than 250 U.S. branches and 21 distribution centers in the U.S., Canada and Mexico. He also supports Grainger’s U.K.-based Cromwell Group.  

With an emphasis on team member safety, best-in-class service and continuous improvement, these teams are focused on providing the products customers need to keep their businesses running and their people safe. 

Rob has deep expertise in fulfillment operations. He has held various leadership positions at Grainger since joining the company in 2008, including Vice President, Distribution Operations, Senior Director, DC Operations Excellence, Senior Director, Regional Distribution, and Director of Distribution. 

Prior to Grainger, Rob held leadership roles at Footsmart.com, a Division of Benchmark Brands, Inc., and Amazon.com. 

He is also a retired officer of the U.S. Army where he served as Armor Officer and later Military Police Officer. Some of his specific positions include: Armor/Mortar Platoon Leader, Military Police Company Commander, Regional Corrections Facility Manager, CID Battalion Executive Officer, Army Force Protection Officer-Pentagon Army Staff, and Deputy Provost Marshall. His highest rank achieved was Major, and he is a recipient of the General Douglas MacArthur Leadership Award. 

Rob earned a bachelor’s degree from The Citadel in Charleston, South Carolina, and a master’s degree from the Marine Corps University in Quantico, Virginia. 

Paige Robbins is the Senior Vice President and Chief Operations and Strategy Officer of W.W. Grainger, Inc., a $17.9 billion leading broadline distributor with operations primarily in North America and Japan. In this role, Paige brings together Operations, Supply Chain, Customer Experience, Grainger High-Touch Subsidiaries and Strategy teams to extend Grainger’s competitive advantage through exceptional service, operational excellence and profitable growth across the enterprise.

Paige joined Grainger in September 2010 as Vice President, Logistics Management and has held several roles of increasing responsibility since then. Before assuming her current role, Paige was the Senior Vice President and President of the Grainger Business Unit, where she oversaw Grainger’s integrated commercial function, which included Sales, Customer Solutions, Marketing, Customer Strategy, Merchandising and Supplier Management, along with many of Grainger’s business subsidiaries across North America. 

Prior to this role, Paige served as Grainger’s Senior Vice President and Chief Technology, Merchandising, Marketing and Strategy Officer, where she held responsibility for developing strategy and building MRO and technology solutions for customers and team members. During her tenure, she has also led the Global Supply Chain, Branch Network, Customer Service Centers and Corporate Strategy, where she was responsible for all aspects of the customer experience, from order to delivery.

Before joining Grainger, Paige served as Partner and Managing Director at the Boston Consulting Group (BCG), where she specialized in industrial companies. She helped her clients with a broad range of issues, including growth, customer segmentation, pricing, profit improvement, supply chain and merger and acquisition strategies. 

Paige sits on the Board of Directors for C.H. Robinson, where she is a member of the Audit Committee and the Technology Subcommittee. She is a fellow of the CEO Perspectives program at Northwestern’s Kellogg School of Management.

Paige received both a Bachelor of Science and Master of Science degree in industrial engineering from Stanford University, before earning an MBA from Harvard University.  

Masaya Suzuki was named Managing Director, Endless Assortment Business in January 2020. His responsibilities include overseeing Grainger’s entire endless assortment portfolio, which includes the Zoro businesses.  

In 2000, Masaya joined MonotaRO as part of a joint venture between Sumitomo Corporation and W.W.Grainger, Inc. In 2012, he was named Director, President and COO of MonotaRO, and named Director, President and CEO in 2014. He has since led the company to achieve substantial revenue growth, expand its product offerings and launch new businesses in South Korea, Indonesia and India. Masaya became Director, Chairman and CEO of MonotaRO in 2024.

As part of the Grainger and Endless Assortment Leadership Teams, Masaya continues to focus on product expansion, new and existing customer growth, and driving more independence for Grainger’s Zoro operations. 

Brian Walker is the Senior Vice President, Sales and Onsite Services of W.W. Grainger, Inc., a $17.9 billion leading broad line distributor with operations primarily in North America and Japan. In this role, Brian focuses on driving profitable share gain for complex customers, leveraging the company’s U.S. sales channels and onsite service operations to win with Grainger’s contract customer business.   

Brian has held many roles of increasing responsibility at Grainger. Most recently, he served as Chief Product Officer, preceded by Vice President, Digital Architecture and Operations and President of Gamut.com. While headquartered in London, England, he served as Vice President of Strategy and Marketing for Grainger’s Online Business with operations in Canada, Germany, Japan, South Korea, the United Kingdom and the United States. Brian has also led teams responsible for corporate strategy, merchandising and pricing for the Grainger U.S. Business. He joined Grainger in September 2006 as Purchasing Manager.   

Prior to joining Grainger, Brian led teams in warehousing, logistics, supply chain and sales operations at McMaster-Carr Supply Company.   

Brian holds a bachelor’s degree in economics from Wesleyan University, a master’s degree in applied statistics from DePaul University, and an MBA from the University of Chicago’s Booth School of Business. Brian serves on the Board of Trustees of the Illinois Institute of Technology, the Board Chair Executive Council and is on the Board of Advisors for IIT’s Institute of Design. He has served as a founding board member for Wesleyan’s Quantitative Analysis Center and is a current member of Wesleyan’s President’s Council. Brian also is a Lecturer at Carnegie Mellon University for their CIO and CDigitalO programs.