John M. Calewarts

John M. Calewarts

Attorney John M. Calewarts is a Green Bay area native whose practice is focused on estate planning, mergers and acquisitions, general corporate law, real estate and tax/succession planning.

In addition to being an attorney, John is a CPA, who earned both his Bachelor’s Degree in Accounting and Masters in Accountancy-Taxation.

Prior to joining the Law Firm of Conway, Olejniczak & Jerry, S.C., John worked at a mid-sized Milwaukee-based law firm.

There’s a tax consequence in every legal transaction. Being able to identify that is advantageous for my clients. It puts them in the most favorable tax position and avoids conflicts down the road. For me, success is knowing my clients are aware I’m looking out for their best interests and that they can rely on me to achieve results."

John M. Calewarts


  • J.D. – Marquette University Law School
  • M.Acc.– University of Wisconsin, Madison
  • B.B.A. – Accounting, University of Wisconsin, Madison


  • State Bar of Wisconsin

Affiliations & Memberships

  • Brown County Bar Association
  • State Bar of Wisconsin
  • American Bar Association
  • Milwaukee Bar Association

Professional & Civic Activities

  • Leadership Green Bay, Class of 2020
  • Green Bay Economic Authority Member
  • Member, Green Bay Optimist Club
  • Member, Business Network International
  • Member, Salvation Army Finance Committee
  • Member, Association for Corporate Growth
  • Member, Wisconsin Institute of Certified Public Accountants
  • Member, American Institute of Certified Public Accountants
  • Former Board Member & Treasurer, North Point Lighthouse Friends, Inc.
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231 South Adams Street  |   P.O. Box 23200  |   Green BayWI 54301  |  Phone: 920.437.0476  |  Fax: 920.437.2868