WESCO International, Inc. Board of Directors Announces Succession Plan

- John J. Engel to become President and Chief Executive Officer effective
September 1, 2009
- Stephen A. Van Oss to become Chief Operating Officer effective September 1,
2009
- Richard P. Heyse to join WESCO as Chief Financial Officer effective June 15,
2009
- Roy W. Haley to serve as Executive Chairman until May 2011

PITTSBURGH, May 27 /PRNewswire-FirstCall/ -- The Board of Directors of WESCO
International, Inc. (NYSE: WCC), a leading provider of electrical MRO
products, construction materials and advanced integrated supply procurement
outsourcing services, announced today its intention to name John J. Engel,
President and Chief Executive Officer, effective September 1, 2009. Since
joining WESCO in 2004, Mr. Engel has served as Senior Vice President and Chief
Operating Officer. He has served as a member of the WESCO Board of Directors
since 2008.

Under the Company's succession plan, Mr. Engel will succeed Roy W. Haley who
has served as Chief Executive Officer since 1994, and will have
responsibilities for the day-to-day management of WESCO. Mr. Haley will serve
as Executive Chairman until the completion of his current term as a member of
the Board of Directors in May 2011.

The Board also announced that Stephen A. Van Oss will assume the
responsibilities of Chief Operating Officer on September 1, 2009 and will
continue to serve as Senior Vice President. Mr. Van Oss currently serves as
WESCO's Senior Vice President of Finance and Administration and Chief
Financial Officer, a position he has held since 2000. He is also a member of
the WESCO Board of Directors.

Mr. Richard P. Heyse will join WESCO as Vice President and Chief Financial
Officer on June 15, 2009. Mr. Heyse joins WESCO from Innophos, Inc. (Nasdaq:
IPHS), the holding company for a leading North American manufacturer of
specialty phosphates, where he currently serves as Chief Financial Officer.

James L. Singleton, Chairman of WESCO's Executive Committee remarked, "Roy
Haley has served the Company, its employees, shareholders, customers and
suppliers with extraordinary dedication and skill during his fifteen years as
CEO. We are pleased that he will continue with the Company as Executive
Chairman of the Board for the next two years. We have carefully built a
succession plan over the last several years to provide for a smooth transition
for the next generation of leaders at the Company. Roy has been integral in
ensuring that plan's success. The Board congratulates John Engel and Steve
Van Oss on their new roles and welcomes Richard Heyse to WESCO. We have
worked closely with John and Steve, and they have the Board's full and
complete support in their new responsibilities."

In describing these changes, Mr. Haley said, "For the past several years the
Board of Directors and I have placed a high priority on talent management.
Today's announcement represents a major organizational milestone for the
Company, and I am very pleased that we are immediately able to begin the
process of transitioning to new roles and responsibilities with an experienced
and seasoned management team."

In July 2004, John Engel joined WESCO as Senior Vice President and Chief
Operating Officer with direct responsibilities for all the Company's
marketing, sales, operations, and supply chain business activities. He has
had primary responsibilities for a wide range of operational process
improvement and acquisition-related activities. Mr. Haley said, "John has
been a great business partner, and he has demonstrated the ability to lead the
organization to higher levels of growth and profitability. His grasp of the
strategic opportunities within our industry and his commitment to
organizational development, talent management, and operations execution will
ensure WESCO's continued success."

Early in his career, Steve Van Oss was introduced to electrical equipment
manufacturing and distribution industry through a variety of operating and
financial positions with Reliance Electric. He joined WESCO in 1997 as
Director, Acquisition Management, and soon picked up responsibilities for all
aspects of information technology. He was appointed Vice President and Chief
Financial Officer in 2000. "Steve's leadership in building strong finance and
administrative capabilities has been tremendously valuable for the
organization," said Mr. Haley. "His extensive knowledge of finance, IT and
support functions and his longstanding interests in sales and service
activities will undoubtedly result in new insights and resources for our
operating leaders and business operations."

Richard Heyse has served in key financial management roles for industrial
firms including International Paper, Eaton Corporation, Koch Industries, and
Eastman Chemical. Most recently he served as Chief Financial Officer for
Innophos, Inc, a specialty chemicals producer and NASDAQ listed public
company. "Richard has the kind of background and experience that will ensure
a quick and effective assumption of the company's finance and accounting
responsibilities," said Mr. Haley. Mr. Heyse will join WESCO on June 15,
2009, and he and his family will relocate from the Princeton, NJ area to
Pittsburgh this summer.

WESCO International, Inc. (NYSE: WCC) is a publicly traded Fortune 500 holding
company, headquartered in Pittsburgh, Pennsylvania, whose primary operating
entity is WESCO Distribution, Inc. WESCO Distribution is a leading
distributor of electrical construction products and electrical and industrial
maintenance, repair and operating (MRO) supplies, and is the nation's largest
provider of integrated supply services. WESCO's 2008 annual sales were
approximately $6.1 billion. The Company employs approximately 7,200 people,
maintains relationships with over 24,000 suppliers, and serves more than
110,000 customers worldwide. Major markets include commercial and industrial
firms, contractors, government agencies, educational institutions,
telecommunications businesses and utilities. WESCO operates seven fully
automated distribution centers and approximately 400 full-service branches in
North America and select international markets, providing a local presence for
area customers and a global network to serve multi-location businesses and
multi-national corporations.

The matters discussed herein may contain forward-looking statements that are
subject to certain risks and uncertainties that could cause actual results to
differ materially from expectations. Certain of these risks are set forth in
the Company's Annual Report on Form 10-K for the fiscal year ended December
31, 2008, as well as the Company's other reports filed with the Securities and
Exchange Commission.

SOURCE WESCO International, Inc.

Daniel A. Brailer, Vice President, Treasurer and Investor Relations of WESCO
International, Inc., +1-412-454-4220, or Fax, +1-412-222-7520