Customer Service Experts

Expertise to serve your needs

John Goeser grew up in the agriculture industry as his family’s dairy near Plymouth, Wis. grew from 60 head in the 1980’s to now over 1,000 cows. After earning Bachelor of Science degrees in Dairy Science and Agronomy at the University of Wisconsin-Madison, Goeser earned a Master of Science degree in Plant Breeding & Genetics as well as a Master of Science degree and Ph.D. in Dairy Science from the University of Wisconsin-Madison. After gaining experience in graduate school as a nutritionist, and moving to a technical nutrition and support position within the feed industry, Goeser started his tenure with Rock River Laboratory in 2012. In his current role with Rock River Laboratory, Goeser oversees animal nutrition, technical support, and research, specifically centering his focus on carbohydrate digestion, forage management and trends, and more recently, feed hygiene. Through an adjunct assistant professor appointment with the University of Wisconsin- Madison Dairy Science Department, Goeser contributes lectures discussing carbohydrate digestion, rumen metabolism and forage preservation to the future of the dairy industry. John Goeser, Ph.D., PAS, and Diplomate ACAN

Animal Nutrition, Research and Innovation Director
John Goeser grew up in the agriculture industry as his family’s dairy near Plymouth, Wis. grew from 60 head in the 1980’s to now over 1,000 cows. After earning Bachelor of Science degrees in Dairy Science and Agronomy at the University of Wisconsin-Madison, Goeser earned a Master of Science degree in Plant Breeding & Genetics as well as a Master of Science degree and Ph.D. in Dairy Science from the University of Wisconsin-Madison. After gaining experience in graduate school as a nutritionist, and moving to a technical nutrition and support position within the feed industry, Goeser started his tenure with Rock River Laboratory in 2012. In his current role with Rock River Laboratory, Goeser oversees animal nutrition, technical support, and research, specifically centering his focus on carbohydrate digestion, forage management and trends, and more recently, feed hygiene. Through an adjunct assistant professor appointment with the University of Wisconsin- Madison Dairy Science Department, Goeser contributes lectures discussing carbohydrate digestion, rumen metabolism and forage preservation to the future of the dairy industry. 

John can be reached at: johngoeser@rockriverlab.com

Cliff OckerCliff Ocker, Rock River Laboratory Director of Sales and Client Relations

Director of Sales and Client Relations
Growing up on a small dairy farm in south central Pennsylvania, Cliff Ocker’s roots in animal agriculture run deep. After earning his Associates degree in Agriculture Business Management from Penn State University in 1991, Ocker took on a dairy nutritionist role with a prominent feed company. Ocker spent 17 years in the field as a nutritionist with various feed companies, then translated his field experience to building and supporting customer relationships at a forage laboratory. Most recently, Ocker held a business manager position, selling a feed additive to improve fiber digestion. Ocker joined Rock River Laboratory as the director of sales and client relations in 2018. In his current role, he forges relationships and shares expert insights, Read More from his vast experience, with customers and partners across the regional areas surrounding Rock River Laboratory’s five domestic labs in California, New York, Ohio, and Wisconsin. Outside of his customer support work, Ocker enjoys hunting, spending time with his two daughters and son, and coaching and playing softball and volleyball. 

Cliff can be reached at: cliff_ocker@rockriverlab.com

Mark Kirk, Rock River Laboratory Business Development and Customer Relations ManagerMark Kirk

Business Development and Customer Relations Manager
Growing up in Leander, Texas, Mark Kirk’s deep agriculture roots developed while he spent his younger years raising beef cattle and working on local cattle operations. He diversified his skillset after moving to Illinois, where he worked with row-crop farmers and a farrow-to-finish swine operation. Kirk attended Tarleton State college near Fort Worth, Texas, then finished earning his Bachelor of Science degree in General Agriculture, with a specialization in livestock production, from Southern Illinois University in 2003. Kirk has garnered years of experience in animal nutrition research since then, focusing on selecting hybrids for animal nutrition qualities – specifically dairy corn silage, developing relationships with seed industry professionals, and supplying technical support for dealers. In his role of Rock River Laboratory business development and customer relations manager, Kirk builds and guides seed company relationships, while providing technical expertise to all Rock River Laboratory customers. Read More Now living on a chicken and pig-centric hobby farm in Southern Illinois with his wife and five children, Kirk spends his free time restoring vintages axes, deer hunting, and continuing to hone his cooking and barbecue connoisseur palate.

Mark can be reached at: mark_kirkc@rockriverlab.com

Larry McRobertsLarry McRoberts, Rock River Laboratory Customer Service Representative

Customer Service Representative
Hailing from Eau Galle, Wis., Larry McRoberts spent his early years working on his family’s livestock and crops farm. His work with everything from hogs, poultry and dairy cows, to beans and alfalfa, instilled a love of all agriculture and drew him to an agricultural college. McRoberts earned his Bachelor of Science degree in Agricultural Education from the University of Wisconsin-River Falls in 1968. Since that time, McRobert’s earned experience has included roles as district sales representative - with sales in feed, agronomy, fuel and general ag products from hardware to animal health, district feed sales manager, and state manager of a retail sales force, which involved recruiting and leading training in products and sales. McRoberts joined the Rock River Laboratory team as a customer service representative in 2012, and has continued building relationships around Wisconsin and Minnesota ever since. Read More His inspiration and guiding rule to treat others as you would like to be treated has afforded him many lasting relationships, and no industry event passes without someone sharing their acquaintance with McRoberts. When he isn’t meeting new people or visiting old industry friends, McRoberts can be found outside – getting back to his roots of gardening, hunting, fishing, trapping and teaching this all to the next generation, his grandsons. 

Larry can be reached at: larry_mcroberts@rockriverlab.com

Tabitha KumbierTabitha Kumbier, Rock River Laboratory Forage Data and Customer Support Manager

Forage Data and Customer Support Manager
Born and raised in Watertown, Wis., Tabitha Kumbier spent her youth raising and showing sheep and beef cattle at the local, state, and national levels. A long-time 4-H and FFA member, Kumbier credits her agriculture passion to her heavy involvement in judging competitions, speaking contests and assisting other youth at local education events through these agriculture organizations. She followed her agriculture roots to the University of Wisconsin-Platteville, where she earned a Bachelor of Science degree in Agriculture Business with a Marketing and Communications emphasis and an Animal Science minor in 2013. Before joining the Rock River Laboratory team, Kumbier held roles as a calf feeder at a local dairy, an intern with the Wisconsin Beef Council, and an intern with an artificial insemination company. In her role as the forage data and customer support manager for Rock River Laboratory, Kumbier is a liaison between the laboratory analysis team and agronomy and nutrition customers Read More - providing information, answering questions, problem-solving, and entering data for successful results. In her free time, Kumbier enjoys hunting and fishing, snowmobiling, and crafting, and has competed in turkey calling contests at the State and National Wild Turkey Federation Conventions. 

Tabitha can be reached at: tabitha_kumbier@rockriverlab.com

Rock River Laboratory

Founded in 1976, Rock River Laboratory is a family-owned laboratory network that provides production assistance to the agricultural industry through the use of advanced diagnostic systems, progressive techniques, and research-supported analyses.  Employing a team of top specialists in their respective fields, Rock River Laboratory provides accurate, cost-effective, and timely analytical results to customers worldwide, while featuring unsurpassed customer service.

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