
Our Company Story
Ag Spectrum Company was founded in 1984 by six men who were raised on family farms. They recognized the importance of producing crops in the most cost-efficient way possible and wanted to make a difference in the agricultural industry. The founders based the company on the principles of basic science which provides understanding of what the plants’ nutritional needs are at different stages of development. These needs were used to design the Maximum Farming System®.
With their farming backgrounds, Ag Spectrum’s directors understand the decisions and sacrifices farmers make every day. Some of them continue to farm and use Ag Spectrum products and methodologies in their own fields, gaining firsthand knowledge into what works and what does not. Combined with ongoing research and more than 100 representatives in 20 states, the company is committed to discovering practical ways to develop better fields, produce better yields, and become better farmers. Their comprehensive systems approach helps the American farmer.
Today, Ag Spectrum continues to operate based on three guiding truths:
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There Exists an Optimum
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The Soil is a Living System
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Farmers Deserve Respect

BOARD OF DIRECTORS

Wayne Stuedemann
Chief Executive Officer
Like the other five men who founded Ag Spectrum in 1984, Wayne grew up on a family farm and knew there was a better way to farm. After serving in the U.S. Army, he enrolled at Iowa State University, where he earned a bachelor’s degree in Ag Business. He later earned his MBA from St. Ambrose University. Wayne owned and operated a Purina dealership for several years before helping to found Ag Spectrum Company out of a deep desire to help the American farmer. Wayne was the company’s first dealer. He now leads the corporate staff and a network of independent dealers as CEO.

Garry Brumm
Owner / Board Member
After earning a bachelor’s degree in Animal Science from Murray State University, Garry worked in sales and distribution for a beverage company. He later served as a marketing representative for AgroPlus, where he became acquainted with like-minded individuals who shared a vision to establish a new company to serve the American farmer — a vision that led to the Ag Spectrum Company. Garry has vast experience with a wide range of crops in diverse regions of the country. He shares this knowledge about crop production, ag equipment advancements, and client relationships at company meetings, local grower meetings, and field days.

Terry Metzger
Owner / Board Member
Terry was raised on a farm in eastern Iowa and has farmed in that area for 45 years. He has successfully adopted no-till and strip-till practices, utilizing the Maximum Farming System. After graduating from Taylor University with a degree in business management, Terry worked three years as a business consultant with Deere and Company in Missouri, providing service to 28 John Deere dealers. After returning to Iowa, he joined with five other entrepreneurs to found and build the Ag Spectrum Company that was dedicated to treating agricultural producers with respect and helping them adopt efficient methods of crop production. He is an expert on corn and soybean production, as well as planter and machinery innovations.

Kevin Newgard
Owner / Board Member
Kevin Newgard is one of two members of the Board of Directors actively involved in production agriculture. After growing up on a family farm, Kevin began farming with his dad in 1972 in a grain and dairy operation. He worked in ag marketing before helping found Ag Spectrum in 1984. As a successful grower in northeast Iowa for more than 40 years, Kevin has personally proven the long-term success of the Maximum Farming System® as an integrated systems approach to farming. He understands the importance of hybrid selection, tillage decisions, herbicide interactions, planter attachments, and all aspects of crop production. He speaks to growers throughout the Corn Belt about achieving high yields while planting continuous corn using the Maximum Farming System.

Cliff Ramsier
Owner / Board Member
Cliff Ramsier is one of six men who founded the company in 1984. He is a dedicated student of soil chemistry, plant physiology, and soil microbiology issues that impact crop production. His 45 years of experience in soil science, nutrient management, and crop development have benefitted growers across the country. Cliff is a skillful spokesperson on the Maximum Farming System and can clearly explain how fertility relates to tillage, nutrients, plant energy, and air / water management in the soil. He wrote company newsletters and has co-authored multiple scientific journal articles. Cliff served as Technical Director from 1984 – 2021. He can provide a link between the latest research and the Ag Spectrum clients who use cutting-edge technology and crop production methods.

RESEARCH & OPERATIONS

Dr. Brian Gardener
Technical Director
Dr. Gardener is an internationally recognized expert in soil biology and plant microbial ecology with over 20 years of experience leading research and development projects focusing on biologically-based inputs for sustainable agriculture. After receiving his Ph.D. in Botany at Michigan State University, he joined the USDA’s Agricultural Research Service to work on biocontrol of root diseases. He joined the Ohio State University as a Molecular Microbial Ecologist where he rose to the rank of Full Professor and Director of the Organic Food, Farming, Education and Research program. Before joining Ag Spectrum in 2019, Brian served as Director of Research and Development for Sustane Natural Fertilizer, Inc., a leading manufacturer of organic and natural fertilizers. Using his knowledge of fundamental scientific principles and diverse farming practices, he has successfully developed new products and approaches that increase plant yields and improve soil quality.

Dr. Darrell Norton
Technical Consultant
Dr. Norton received his Bachelor’s and Master’s Degrees from Purdue University and his Ph.D. from Ohio State University. Dr. Norton worked as the former director and a research soil scientist for the USDA-Agricultural Research Service (ARS) National Soil Erosion Research Laboratory (NSERL) at Purdue University. He is a former adjunct professor for Purdue University’s Department of Agronomy and presently an adjunct professor in the Department of Agricultural and Biological Engineering. He has conducted research for NSERL on soil erosion related to reactions between soil and rainwater and clay water interactions. Much of his research has focused on relatively clean high Ca and S containing materials from air purification systems of coal-fired power plants for erosion control and other benefits. Dr. Norton and co-authors have published more than 290 articles and technical reports. He presents results on his research at Scientific Congresses all over the world. Sabbaticals include University Federal of Lavras Brazil, EMBRPA Brazil, CSIRO Australia and Agricultural University of Vienna.

Dr. Jim Smart
Research & Teaching Agronomist
Raised on a farm in Southeast Kansas, Dr. Jim Smart graduated in Agronomy and Ag Business from Kansas State University. After working a short time for DuPont, he returned to school and earned a Master’s degree and a Doctorate in Agronomy and Weed Science, researching wheat and corn herbicides and their side effects. Dr. Smart worked 10 years as a research scientist with the USDA-ARS in Weslaco, Texas, where he helped cotton farmers adopt conservation practices and supervised pesticide projects for minor use crops. In 2001, Dr. Smart became a researcher for Ag Spectrum Company, where he speaks to hundreds of farmers each year, in the field and from the stage. His favorite part of the job is working with a farmer to help his crop recover from stress and seeing the end result.

Robin Petersen
Vice President of Operations
Robin holds a bachelor’s degree from St. Ambrose University and spent 17 years as a CPA in public accounting before joining the Ag Spectrum team in 2003. Through her own practice and positions with KPMG, Gary Foster CPA, and DeWitt Bank Tax & Accounting, Robin brought her experience in accounting, compliance, payroll, as well as corporate and individual tax returns. She has worked extensively with farmers on taxes and planning. At Ag Spectrum, Robin’s duties include execution and oversight of all financial functions, compliance, human resources, and meeting coordination. She supervises day-to-day operations including distribution, inventory management, marketing, technology, and GIS functions and has helped integrate new technology solutions company-wide. Robin leads a staff of dedicated employees who provide professional service and support to associates and farmers to meet their crop planning, product, Maximum Farming Reports, and soil sampling needs.

Brian Macomber
Information Systems Manager
Brian earned a bachelor’s degree in Management Information Systems from Iowa State University in 2002. Since joining Ag Spectrum in 2003, Brian has helped associates and staff members use time-saving technology tools to meet the needs of progressive farmers and best utilize ag computers and precision farming data. Brian manages our corporate Information Technology Systems, develops unique software solutions, and provides technology support to dealers, employees, and managers. During his tenure at Ag Spectrum, Brian has created Professional Support Tools, a recommendation engine, our ST/MZ and mapping programs, and MEDS (a nutrient planning program). He also developed Dealer Tools, and continually updates the software app for use on mobile devices.

Lee Swanson
Distribution Manager
Before joining the Ag Spectrum team in 2024, Lee spent nearly three decades in freight handling, operations, and supply management. Most recently, he was the Facility Manager for Supply Chain Services & Solutions (SC2). Lee received a bachelor’s degree from Clarke University in Dubuque, IA. He now manages Ag Spectrum’s distribution processes, oversees product registration & licensing, material availability, replenishment, storage and movement.

SALES MANAGEMENT

Eric Sherwood
President and National Sales Manager
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Eric is responsible for the growth and development of the Ag Spectrum independent associate network who bring the Maximum Farming System® to the farm. He came to Ag Spectrum in 2009 after serving as a regional manager for Precision Planting, where he led dealer recruitment and sales for 250 dealers in 27 western states. Previously, he worked 13 years with Farmland Industries and as a private consultant to ag retailers. Eric was raised on a diverse crop and livestock operation. He holds a bachelor’s degree in Ag Economics from the University of Missouri. He resides in Platte City, Missouri, with his wife.

Delk Crosier
Maximum Farming Implementation Consultant
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Delk helps guide our clients to success as the Maximum Farming Implementation Consultant. He has had significant experience utilizing the Maximum Farming System on his own farm for the past 37 years. In addition to his college education in Ag Equipment and Mechanics at MCJVS, Delk has received extensive training specializing in system technologies, crop diagnostics, and yield enhancement. After more than 21 years in the seed industry and Purdue Crop Diagnostics Training, he joined Ag Spectrum in 1993. Delk previously served as an Associate and later as an Area Manager before taking on his current role. He and his family reside in West Alexandra, Ohio.

Shane Frantum
District Manager
Shane grew up on a family farm in Jamaica, Iowa, located northwest of Des Moines. He and his brother took over the family farm in 2015 and still run it together today. Prior to joining Ag Spectrum, he spent his career in seed sales. Today, he uses that experience to help farmers and Ag Spectrum Associates drive efficiency, improve performance and focus on maximizing profitability. Shane was drawn to Ag Spectrum by the opportunity to bring farmers solutions for the many challenges they face, and to bring technology and management solutions that can materially change their balance sheets. He sees Ag Spectrum as a close-knit family-oriented business with emphasis on relationships and doing the right thing by putting customer profitability first. Shane attended Iowa State University where he earned a degree in Agricultural Business and met his wife. They and their two children reside in Grimes, Iowa.

Erik Larson
District Manager
Erik received his bachelor’s degree in Agricultural Science from Northwest Missouri State University. He has worked in agricultural sales and management for his entire career. He worked for Syngenta as a seed representative for the Golden Harvest brand. Erik worked as national sales manager of the Brodbeck seed brand for Dow AgroSciences. He was raised on the family farm near where his family resides in Tipton County, Indiana. Erik and his wife have two children. They raise cattle, on a small scale, for 4H projects and have a Club calf herd. He judges 4H shows and is also a professional livestock judge for cattle, sheep, and pigs for open shows, county, and state fairs. With more than 20 years of experience providing sales support and management to growers and sales representatives, Erik is equipped to lead Associates and encourage the implementation of the Maximum Farming System.

Ethan Morford
District Manager
Ethan Morford of Homestead, IA serves as Ag Spectrum District Sales Manager in Eastern Iowa, Northern Illinois, and Wisconsin. Ethan attended Iowa State University where he majored in both horticulture and agronomy. He began his career as a cooperative Field Sales Agronomist promoting seed, fertilizer, and chemical. Prior to joining Ag Spectrum, he spent 8 years as a District Sales Manager for Jacobsen Seed. Ethan uses his strong agronomic technical ability to help Maximum Farming System farmers and Associates thrive.

Brianna Powell
Marketing Communications Coordinator
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Growing up on her family’s farm on the Illinois-Iowa border, Brianna’s passion for agriculture developed early in life. In May of 2021 she earned a bachelor’s degree in Agricultural Business, Economics, and International Agriculture from Iowa State University. During her education she completed multiple marketing internships for a variety of agriculture-based companies including Corteva Agriscience and Landus Cooperative. Her duties included social media content creation, sales team support, community outreach, event management, departmental marketing campaign implementation, digital marketing analytics, and copy writing for various audiences. Now part of the Ag Spectrum team, Brianna executes our marketing and social media presence.

Greg Vincent
District Manager
Greg joined the Ag Spectrum team to provide leadership and support for Area Managers and Associates. Prior to joining Ag Spectrum, Greg was editor of Ag Web, the website division of Farm Journal Media. He first joined the group as editor of their magazine, Top Producer, in 2007. Greg’s passion for serving agriculture began at a young age while accompanying his father (a writer for Successful Farming magazine) on business trips where he experienced various types of agriculture. Growing up, Greg worked on his uncle’s farm in southeastern Iowa during the summer months before earning a degree in Agriculture Journalism from Iowa State University. He began his career working in ag marketing with advertising agencies and is the former editor of Dealer & Applicator, a magazine for fertilizer and chemical retailers. He and his family reside in Smithville, Missouri.

Dustin Warf
District Manager
In his home state of Illinois, Dustin supports Maximum Farming System Associates as District Sales Manager. He holds a Bachelor’s Degree in Agricultural Systems with a focus in Plant and Soil Sciences from Southern Illinois University. Since receiving his degree, Dustin has worked exclusively in the agriculture industry with his previous role being Area Sales Manager for Growmark. He is able to utilize his more than 16 years of agricultural sales and management experience to excel in his current role with Ag Spectrum Company providing valuable leadership to Associates and clients. He and his family reside in Windsor, Illinois.

Coulton West
District Manager
Coulton West supports Maximum Farming System Associates in Ohio and Michigan. Coulton has spent his career in leadership and problem-solving roles, improving efficiency and production in multiple industries that encompass crop and livestock production, and pipeline construction. Prior to his current role, he worked in seed sales as a District Sales Manager for Syngenta’s Golden Harvest brand helping farmers select the best varieties for their operations. What brought Coulton to Ag Spectrum was the opportunity to guide farmers through the entire growing season and beyond.

Pat Tomlinson
Farm Manager Consultant
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A native of central Illinois, Pat grew up on a crop and livestock farm near Macon. He earned a Bachelor of Science in Agricultural Economics with a concentration in both Farm Management and Agricultural Marketing at the University of Illinois at Urbana-Champaign. After college, he first began working for a small family seed company in Sullivan, Illinois. A year later, he began a 37 year career with Pioneer Hi-Bred. Pat was a District Sales Manager leading a team of independent sales representatives in central Illinois, and also worked directly with farmers. When Pioneer Hi-Bred became DuPont Pioneer, he had dual responsibilities for marketing and servicing both independent sales representatives, and crop protection products through Ag Retailers. In 2009, Pat began working with professional farm managers in the eastern U.S. with a primary focus on Illinois and Indiana. After joining Ag Spectrum as District Manager, he was awarded the 2017 “Service to Agriculture” award by the Illinois Society of Professional Farm Managers and Rural Appraisers (ISPFMRA). Pat is now a Farm Manager Consultant with Ag Spectrum. He resides near Mt. Zion, Illinois with his wife and continues to be involved with the family farm.
