Atkore is an industry leader in the manufacturing of galvanized steel tubes and pipes, electrical conduit, armored wire and cable, metal framing systems and building components; serving a wide range of construction, electrical, fire and security, mechanical and automotive applications.

Our Razor Ribbon® barbed tape is engineered for consistency in structure and material composition, and conforms to federal, state and industrial specifications. All barbed tape products are manufactured from exceptionally tough, high quality stainless steel components. Recognized products include Instabarrier, Detainer Hook Barb, and Supermaze.
Philip W. Knisely Chairman of the Board of Directors, Atkore International
Mr. Knisely is an operating advisor to Clayton, Dubilier & Rice and has served for over 20 years as a senior executive in the diversified industrials category. Mr. Knisely spent a decade as Executive Vice President and Corporate Officer of Danaher Corporation, where he was responsible for businesses totaling more than $4 billion. Prior to Danaher, Mr. Knisely co-founded Colfax Corporation, a designer, manufacturer, and distributer of fluid handling products, serving as President and Chief Executive Officer. Previously, Mr. Knisely was President and Chief Executive Officer of AMF Industries, a privately held diversified manufacturer, and spent ten years at Emerson Electric. He serves on the Board of Trustees of the Darden School Foundation at the University of Virginia, where he received his M.B.A. Mr. Knisely was also a GM Fellowship Scholar at General Motors Institute, where he earned a B.S. in industrial engineering.
James G. Berges
Mr. Berges is a partner at Clayton, Dubilier & Rice and has been with the firm since 2006. Previously, he served as vice chairman and president at Emerson Electric Co., where he led corporate growth and development activities and was responsible for the company's motors and appliance components, industrial automation, and network power businesses. Previously, he worked at General Electric Company. Mr. Berges is chairman of Hussmann International, Sally Beauty Holdings, Inc. and HD Supply, Inc. and serves on the boards of Atkore International, NCI Building Systems, Inc. and PPG Industries, Inc. He is a past chairman of the National Association of Manufacturers and also received a presidential appointment to the Advisory Committee for Trade Policy and Negotiations in March 2005. He holds a B.S. in electrical engineering from the University of Notre Dame.
Nathan K. Sleeper
Nathan K. Sleeper is a partner at Clayton, Dubilier & Rice and has been with the firm for eleven years. He led CD&R's investments in Atkore International, Hussmann International and NCI Building Systems and serves as a director at Atkore, Culligan, HD Supply, Hertz, Hussmann, NCI and U.S. Foodservice. Previously, Mr. Sleeper played an integral role in the firm's investments in Alliant, Brakes and Jafra. Prior to CD&R, he worked in the investment banking division of Goldman, Sachs & Co. and at investment firm Tiger Management. Mr. Sleeper holds a B.A. from Williams College and an M.B.A. from Harvard Business School.
J.L. Zrebiec
Mr. Zrebiec is a principal at Clayton, Dubilier & Rice and has been with the firm since 2004. He has played a key role in the execution of several of the firm's transactions, including the investments in Atkore International, Hussmann, NCI, Rexel and Hertz. He is a director of Atkore, Hussmann and NCI. Previously, he worked in the investment banking division at Goldman, Sachs & Co. Mr. Zrebiec graduated from the University of Pennsylvania with a B.S. in economics and earned an M.B.A. from Columbia University.
George R. Oliver
Mr. Oliver has been President-Tyco Fire Protection (TFP) since September 2010. Prior to that, he was President of Tyco Safety Products from 2006 to 2010, was named President of Tyco Electrical & Metal Products business in March 2007, and assumed the leadership of International Fire (Fire Protection Services) in October 2009. Mr. Oliver was recently named to become Chief Executive Officer of the Tyco Commercial Fire & Security business upon the separation of Tyco into three public companies. Prior to joining Tyco, Mr. Oliver served in operational roles of increasing responsibility at several General Electric (GE) divisions. Until 2006, he was president and CEO of GE Water and Process Technologies, where he led all aspects of a $2-billion water-related products and services business with more than 7,000 employees worldwide. Mr. Oliver also served as president and CEO of GE Engine Services with global responsibility for the $5-billion aircraft engine services business. Additionally, he held leadership positions in GE's Aircraft Engines and Appliances divisions. He holds a Bachelor's degree in mechanical engineering from Worcester Polytechnic Institute.
Mark P. Armstrong
Mark P. Armstrong has been Vice President of Mergers & Acquisitions of Tyco International since November 2004. Since joining Tyco, Mr. Armstrong has led the process that has completed over 35 acquisitions with an aggregate purchase price exceeding $4 billion and the divestiture of approximately 100 companies with revenues approaching $7 billion. Previously, Mr. Armstrong led the corporate development group of Ingersoll-Rand Company, where he was responsible for negotiating and closing over twenty acquisitions and divestitures with a total transaction value of about $7 billion. He also led the strategic planning process for the company. Most recently, he served as President and General Manager of the Dor-O-Matic, Inc. division of Ingersoll-Rand. Before joining Ingersoll-Rand, Mark served as a Manager of Corporate Planning and Development at Allied Signal. Mr. Armstrong earned a Masters in Business Administration from Washington University in St. Louis, Missouri and a Bachelor of Science from St. Louis University.
Robert M. Roche
Mr. Roche is Chief Financial Officer of Tyco Fire Protection. He joined Tyco in July 2003, serving as Director, Financial Planning & Analysis from 2003 to 2005, Controller of Tyco Fire & Security from 2005 to 2006 and Chief Financial Officer of the Fire Suppression & Building Products business from 2006 through 2009. Mr. Roche was recently named Vice President of Financial Operations for the Tyco Fire & Security company to be created upon the separation of Tyco International into three public companies. Prior to joining Tyco, Mr. Roche held leadership roles at Bristol-Myers Squibb (BMS) including Director of Corporate Financial Analysis, Director of Finance for the Virology Unit, and Finance Manager for the Latin America region. Mr. Roche earned a Bachelor's degree in Accounting from the University of Scranton, an MBA from New York University's Stern School of Business, and is a certified public accountant.
John P. Williamson
John P. Williamson joined Atkore International as President and Chief Executive Officer on June 1, 2011. Mr. Williamson previously spent six years with ITT Corporation, most recently as President of the Water & Wastewater Division. Prior to that, he was President of the Residential and Commercial Water Division and ITT Corporate Vice President and Director for Operational Excellence. Prior to ITT, Mr. Williamson was employed for more than 17 years within several operating divisions of Danaher Corporation. Until 2005, Mr. Williamson was Senior Vice President of Global Operations for Fluke Corporation. Mr. Williamson also served as President of Jennings Technology Corporation. Additionally, he held leadership and management positions at Veeder-Root Company, Danaher Controls, Dynapar and Disc Instruments. Mr. Williamson began his career with Connector Technology, Inc. in 1981. Mr. Williamson earned a B.A. degree in Business Administration from California State University Fullerton and holds a Certificate in Strategic Marketing Management from Harvard Business School.