WernerCo Worldwide Home Page WernerCo Professional Brands offers a global portfolio of 14 professional and trades brands designed to keep jobsites across the globe safe and secure. WernerCo is the world leader in the manufacturing and distribution of ladders, climbing equipment and ladder accessories under the Werner®, Green Bull®, Keller®, and other licensed brands. Werner also manufactures jobsite, truck and van storage equipment under the KNAACK® and WEATHER GUARD® brands. All Werner ladders and climbing equipment meet or exceed applicable Occupational Safety and Health Administration (OSHA) and American National Standards Institute (ANSI) codes and standards for strength and structural integrity. Werner is headquartered in Greenville, Pennsylvania.