About MBA

Who we are and what we do.

Midwestern BioAg is a program, not a quick-fix. We fertilize most every crop known to man – from alfalfa to zucchini. So whatever you farm and whatever size your operation, we can help you be more productive.

Our knowledge is based on decades of experience. Tillage, no-till, organic – it doesn’t matter. We work with it all so you can be more profitable.

What drives us.

We’re a company driven by ethics. While we’re dedicated to helping farmers and ranchers become more productive and profitable, we’re equally dedicated to an agriculture that is safer, healthier, and more sustainable for future generations.

We believe that the principles of biological farming provide the basis for a revitalization of agriculture and rural communities. Working with nature gives abundant yields, superior quality crops and livestock, and, equally important, a better quality of life.

The name BioAg stands for Biological Agriculture. It’s a dramatic contrast to ‘conventional’ or ‘assembly line’ agriculture. Bio stands for life, and logical represents common sense. Therefore, biological farming is working with the life in the soil, with plants, and animals – using a common sense approach that embraces, rather than attempts to dominate, nature. We do everything we can to promote life. And, while quantities of commodities produced on your farm remain important, we place equal importance on quality. Knowledgeable consumers are demanding natural, unadulterated foods, and our goal is to help you profitably tap into that ever-growing market.

We truly believe in our mission statement: We’re here because we have a passion for farming, a desire to change agriculture for the better, and the belief that farming should be profitable and fun.


The People Behind Midwestern BioAg.

Gary Zimmer, President and Co-Founder

Gary Zimmer President Midwestern BioAgGary Zimmer is an internationally known author, speaker and consultant in biological farming. He helped begin Midwestern BioAg in 1984 as one of the founding partners. He is the author of two books, numerous articles on soils and livestock nutrition, and has addressed audiences around the globe. He serves as President and Chairman of the Board, and as “Chief Visionary Officer” for Midwestern BioAg. He has made a profound impact on thousands of farms across the United States, and helped improve agriculture worldwide.

Zimmer owns and operates, with his family, Otter Creek Organic Farm, near Lone Rock, WI.


Dr. Tony Michaels, CEO

Dr. Tony Michaels, CEODr. Anthony Michaels (Tony) is a nationally recognized leader in environmental science, innovation and sustainability.  As Chief Executive Officer, he has spearheaded the creation of a comprehensive plan to expand Midwestern BioAg’s reach throughout the United States, and eventually, the world. He is dedicated to helping farmers be more productive and profitable and to making agriculture as a whole, safer, healthier and more sustainable.

Dr. Michaels is also co-Founder and co-Managing Director of Proteus Environmental Technologies.  Past business positions include roles as Chief Scientist at Pegasus Capital Advisors, President of ReCommunity Energy and CEO of PhycoSystems.  Before entering business in 2008, Dr. Michaels had an academic career in environmental and ocean sciences. He was the first Director of the University of Southern California’s Wrigley Institute for Environmental Studies and he worked at the Bermuda Biological Station for Research. Among his many board positions, Dr. Michaels is Chair of the board for the National Council for Science and the Environment and a Board member at the Global Institute on Sustainability at Arizona State University.  Previously, he has been Chair of the Council of Environmental Deans and Directors, the Catalina Island Conservancy and the NSF Advisory Committee on Environmental Research and Education.

Dr. Michaels was educated at the University of California, San Diego, the University of Arizona (BS, MS) and the University of California, Santa Cruz (Ph.D.).  In the past 30 years he has published 100 scholarly papers.

Tony currently resides in both Madison, Wisconsin and Los Angeles, California with his wife, Claire.


Duane Siegenthaler, COO

Midwestern BioAg, COO

Duane Siegenthaler has been a key person in Midwestern BioAg since 1991. Beginning as an Independent Consultant in southwestern Wisconsin, his understanding of the BioAg program and ability to transfer that knowledge to the farmer allowed his business to grow substantially over the years. In 2008, Siegenthaler merged his business with the MBA organization. He was named Chief Operating Officer in 2012, and is responsible for the daily sales and operations of the company throughout the Upper Midwest.

Siegenthaler lives with his wife, Brenda, near New Glarus, WI.

To learn more about Duane, visit his LinkedIn profile.


Ron Mason, CPO

CPO, Midwestern BioAgRon Mason joined Midwestern BioAg at its inception in the 1980”s and has served the company in numerous roles over his career. He brings a thorough understanding of products, formulas, logistics, regulatory requirements and finance to his role as Chief Procurement Officer. Mason works with MBA’s providers of raw materials, manufacturers and storage providers to ensure adequate product flow into the MBA system. He maintains key contacts throughout the fertilizer and mineral industries as the primary contact person for MBA.

Mason lives with his wife, Ann, near Barneveld, WI.

To learn more about Ron, visit his LinkedIn profile.


Ronnie Kurschner, VP of Operations

VP of Operations, Midwestern BioAg

Ronnie Kurschner relies on his more than 20 years of experience in operations, product flow and application to serve MBA as Vice President of Operations. He is responsible for the daily plant operations of the Blue Mounds and Utica, MN facilities, including inventory control, staffing, equipment, maintenance, application services and logistics. Along with his son, Jeff, Kurschner directs the Dispatch Department of Midwestern BioAg.

Kurschner lives with his wife, Cherie, in Blanchardville, WI.

To learn more about Ronnie, visit his LinkedIn profile.


Bruce Baker, CFO

CFO, Midwestern BioAgBruce Baker joined Midwestern BioAg as Chief Financial Offer in June, 2012, after working as a Certified Public Accountant. Baker, who grew up on a farm near Mineral Point, holds both a CPA license and a Masters of Business Administration Degree from Edgewood College. He is responsible for the financial management of the company in all areas of accounting, taxes, human resources, budgets and strategic financial planning.

Baker, a former college athlete and high school football coach, lives with his wife, Tasha, and their three children in Fort Atkinson, WI.

To learn more about Bruce, visit his LinkedIn profile.


Tom Vander Heiden, VP of Growth and Development

Tom Vander Heiden joined Midwestern BioAg in the fall of 2012 after three decades of working in agribusiness. His extensive experience in production agriculture, fertilizer plant operations, livestock nutrition and business development uniquely qualified him to lead Midwestern BioAg into new markets and opportunities. Vander Heiden relies on his extensive network within the industry, along with his market analysis skills, to lead MBA’s growth in new products, programs and geographic areas.

Vander Heiden lives with his wife, Beth, in New Praque, MN.


Jennifer Hasburgh, Executive Project Manager and Secretary of the Corporation

linkedinJennifer Hasburgh assumed the role of Senior Staff Analyst for Midwestern BioAg in the fall of 2012, after two years as a primary member of the Dispatch Department. During her time in that role, her dedication to detail, analytical skills, IT capabilities and her understanding of complex processes and procedures, distinguished her as a vital member of the management team. Ms. Hasburgh directs and completes numerous research and analytical projects, as well as assists the Chief Executive Officer in daily operations.

Ms. Hasburgh holds a Bachelor Degree in Biology from the University of Wisconsin-Platteville. She lives with her husband, Scott, and their daughter Niki, in Highland, WI.

To learn more about Jen, visit her LinkedIn profile.


Mike Beringer, Director of HR

Mike Beringer







Leilani Zimmer-Durand, VP of Education, Training and Outreach

Leilani Durand