Our founder Dr Patrick Zimmerman created C-Lock Inc in 2005 in Rapid City, South Dakota.

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Dr. Patrick Zimmerman

C-Lock Inc. professionals utilize cutting-edge science and engineering to monitor, analyze, and control cattle biological parameters. Through a systematic approach that incorporates intelligent data-mining techniques, measurements, and numerical modeling, we can detect problems that lower efficiency and productivity. Our unique capabilities to pinpoint problems, identify opportunities, and offer a cost-effective solution saves our clients money.

Our company focuses on agricultural practices but also has experience in measuring emissions related to energy production. We have created GreenFeed (US Patent 7966971, others pending), a system that measures methane and metabolic carbon dioxide emissions from ruminants such as cattle to provide farmers and ranchers with real-time data to document improvements in feed efficiency and lower methane emission losses.

The C-Lock Inc. staff of talented scientists, engineers, and technical personnel are eager to provide their expertise to support your industry. If you have an engineering problem related to energy efficiency or GHGs, we can solve it.


Dr. Patrick Zimmerman


Dr. Patrick Zimmerman was the Director of the Institute of Atmospheric Sciences and a professor in the Department of Atmospheric Sciences at the South Dakota School of Mines and Technology when he founded C-Lock Inc in 2005 he specializes in engineering education, technology development, and research. Zimmerman's research career has spanned nearly four decades. Research Profile

Scott Zimmerman

President and Director of Engineering

Scott Zimmerman is the director of engineering at C-Lock Inc. He has many years of experience with numerical modeling and large databases, and has a solid background in analytical measurements. He has a bachelor's degree in civil engineering from Washington State University and a master's degree in water resource engineering and hydraulics from the University of Iowa.

Tom Zimmerman

Chief Technology Officer

Tom Zimmerman is the lead person for parts development and assembly. He understands every part and component inside our instruments and how to repair and maintain them. He has a degree in interdisciplinary science from the South Dakota School of Mines and Technology.

James Krause

Mechanical Engineer

James Krause is the lead mechanical engineer at C-Lock Inc. He has many years experience and training in metal fabrication, custom parts design, and project management. He has a mechanical engineering degree from the South Dakota School of Mines and Technology.

Colin Murphy

Production Manager

Colin leads our production team. He manages the fabrication and assembly departments and also ensures the highest quality and functionality before any product leaves the shop. Colin earned his bachelor’s degree in Mechanical Engineering from the University of Colorado and a Master of Business Administration degree from the University of South Dakota.

Mike Billars

Vice President of Engineering and Support

Mike leads our electrical engineering department, programming and also is the head of our support team. He has been instrumental in development and support of our products. He has an electrical engineering degree from the South Dakota School of Mines and Technology.

Curt Westberg

Sales Associate

Curt has decades of expertise in selling high tech solutions to various types of customers. BS in Wildlife Biology and an MA in Literature, selling was something he was trained for. He has a life long relationship with the Zimmerman's, team ropes in his spare time, and has worked with both PhD's and ranchers over the years. He shares the company commitment to combine cutting edge science and practical knowledge to create tools both cattle producers and researchers can utilize.

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Ted Cunningham

Sales Associate

Ted is located in south central Missouri and acquired his degrees in Animal Science and Ruminant Nutrition. Ted's experience in the beef industry rang from nutrition, commercial beef production systems, seed-stock management and marketing, which provide him with a vast perspective of the beef industry. Ted, along with wife Ashlee and three children own and operate Cunningham Livestock, which specializes in custom cattle feeding and management, along with replacement heifer and bull development. . He believes improvements in both feed and management efficiency for the beef business is critical for long term industry sustainability and profitability

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Dr. Degong Pang

Sales Associate

Degong is a graduate of the Swedish University of Agricultural Sciences with a PhD in animal science with specialization in animal nutrition and management. During his studies in Sweden he focused on forage quality in Nordic conditions and the effects of dietary factors on ruminant greenhouse gas emissions. Degong utilized our GreenFeed units and after 7 years of study and research with 10 journal publications, and leading several conferences he has joined our team

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