John Wisniewski

P: 920-996-1204

John’s experience includes extensive involvement in the planning, supervision and review of various audit and review engagements in the manufacturing/wholesale, construction and agricultural and food processing industries, including consolidated and combined financial statements, and the preparation of corporate tax returns, including consolidated and multi-state returns. He is also experienced in management consulting. 

John is a leader of Schenck’s Agricultural and Food Processing industry team and a member of Schenck’s Manufacturing/Distribution industry team.

John has been involved in the analysis of business acquisitions, and has investigated fraud and employee embezzlement.

He joined Schenck in January 1986, and became a shareholder in January 1999.


University of Wisconsin—Whitewater, BBA, Accounting, graduated Cum Laude

Professional memberships

  • Wisconsin Institute of Certified Public Accountants
  • American Institute of Certified Public Accountants
  • Associate Member of Association of Certified Fraud Examiners

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What our clients say

“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.
“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
“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