Mark Diederich

P: 920-455-4169


Mark has more than 20 years of experience providing accounting, tax planning and business financing services to a variety of closely-held businesses, with a special concentration in serving the agricultural industry. Mark leads the producer division of the Agriculture & Food Processing team at Schenck. Raised on his family’s dairy farm, he brings a deep understanding of the industry and special insight to his work with clients as a result of his first-hand experience. He is skilled in financial projections and forecasting, as well as financial statement compilations and reviews.

In addition, Mark is also a member of Schenck’s Manufacturing & Distribution team and works with wood, metal, stone and sand quarry companies. His experience includes extensive involvement in forecasting, assisting clients with LIFO inventory and providing overhead analysis and product costing.


  • Assisted two manufacturing clients that have received $450,000 and $144,000 in Wisconsin Economic Development Tax Credits.
  • Identified more than $5,000 in tax credits for a new manufacturing client. Advised that this same client become an S Corporation for tax savings. Most recently worked with them on obtaining Wisconsin Economic Development Tax Credits.


University of Wisconsin–Green Bay, BBA, Accounting

Professional memberships

  • American Institute of Certified Public Accountants
  • Wisconsin Institute of Certified Public Accountants

Community involvement

  • Baird Creek Preservation Foundation, Inc., Treasurer
  • New Leaf Market, Financial Advisor

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What our clients say

“Schenck has served as a key player in FEECO’s success over the years. Our business has grown and expanded to serve new markets, and Schenck has the depth of personnel to continue to meet our increasingly complex accounting and tax needs. I appreciate their timely and responsive service throughout the year.” - Dan Madigan, President, FEECO International
“Schenck has provided invaluable service and advice to me, to Johnsonville Sausage, and to the entire Stayer family for the past 11 years. I have found the Schenck team to be extremely proactive in strategy and their client service is second to none. They are more than an accounting firm; they are true partners in our success.” - Ralph Stayer, CEO, Johnsonville Sausage, LLC
“It is nice to work with a regional accounting firm that is focused on companies our size. We are treated like an 'A' client. Our audit committee is impressed with Schenck’s candid feedback and the strategic direction they provide. The leaders on the job are consistent and take the time to understand our business and our goals.” - Bob Kamphuis, CEO, President, Chairman of the Board, Mayville Engineering Company, Inc.