Robert (Bob) McMasters
University of Michigan – Bachelor of Business Adminstration 1959
Bob worked with Allis Chalmers, Parker Seal and rubber seal distributors in the Detroit Metropolitan area before starting the company in 1977.
Bob was President of the Red Run Golf Club, Golf Association of Michigan and Western Golf Association on his spare time culminating a long professional and personal
Martin (Marty) Koss
Michigan State University – Bachelor of Science in Mechanical Engineering 1965
Marty was a civil corps officer in the U.S. Navy Corps of Engineering at the Seebees base in Virginia
Marty worked for Standard Oil and seal distributors in the Detroit Metropolitan area before starting the McMasters Koss partnership.
A partnership ensued with strong family values throughout the organization. Many members of the families have contributed to the success of the organization and most employees have been with McMasters Koss for an average of 15 years or more
Significant Milestones include purchase of first operational building in 1982 and implementation of QS9000 Quality System in 2000.
Since that time, the McMasters Koss corporate complex encompasses 4 buildings and over 50,000 square feet for inventory, laboratory and inspection facilities.
In 2018, McMasters Koss sales surpassed $21MM and current management has invested in infrastructure and staffing to make McMasters Koss foremost in the automotive and truck rubber product and seal industry.
Gary Gibbs – President and Chief Executive Officer
University of Michigan – Bachelor of Science in Mechanical Engineering
Gary started his career as an engineer at United Technologies and joined GM as a project manager in 1985.
He joined McMasters Koss in 1994 and became President/Owner in 2000.
Over 40 Years experience in engineering, computer science and corporate management within automotive manufacturers worldwide.
Ed Koss – Vice President
Michigan State University – Bachelor of Arts in Business Administration
Mercer University – Master of Business Administration
25 years experience in gasket and seal industry with strong background in automotive seal requirements across North America.
An dedicated engineering team and facilities have also been incorporated into the organization with state of the art oil seal test equipment, a tooling center and automated inspection machines for superior OEM support of zero defect APQP O-Rings and seals.
McMasters Koss Bulk Parts Shipment 
McMasters Koss Commercial O-Ring Inventory Hallway 
Customer Specific O-Ring Inventory 
McMasters Koss Bulk Inventory Area 
McMasters Koss Bulk OEM Storage Facility 
McMasters Koss JIT Delivery System 
McMasters Koss Durometer Testing Center 
McMasters Koss Inspection Capabiltiies 
ASTM Specifications for Testing and Compliance 
McMasters Koss Global Shipments McMasters Koss Headquarters Complex 
McMasters Koss Oil Seal Environmental Test Chamber 
Custom Molded Rubber Seals 
Fluorocarbon O-Rings and Molded Seals 
Extruded Rubber Gasket 
Custom Molded Rubber Seals 
O-Rings 
McMasters Koss APQP Compliance 
Custom Molded Ball Seals 
Custom Molded Rubber Seals 
Oil Seals 
Custom Molded Rubber Seals 
Custom Molded Rubber Seals 
Extruded Rubber Seals