Gerald A. Ontko

Email: Gerald A. Ontko | Phone: 414-272-1424

Gerald Ontko is a Certified Public Accountant with the firm, who provides accounting support for both civil and criminal audits and investigations. He has extensive experience as a forensic accountant and with the litigation of criminal tax and related civil tax matters. His experience also includes positive results in the documentation and recovery of client embezzled funds through insurance recoveries. He has assisted Zetley Law Offices in advising on numerous tax controversy cases from the examination, appellate, and litigation level, on both the Federal and State level. Ontko joined Zetley Law Offices, S.C. as an accountant in January of 2018 after serving as a Financial and Litigation Analyst for the US Attorney’s Office in Chicago, IL. Ontko previously worked for the Internal Revenue Service as a Criminal Investigator in Chicago, IL and Milwaukee, WI. Ontko was also a Senior Manager with the accounting firm KPMG LLP in Chicago, IL (Forensic and Litigation Practice) and was an instructor with the Becker CPA review in Milwaukee. Ontko and his wife are both from Wisconsin and enjoy traveling, and spending time with their three grandchildren.

Admissions and licenses

  • Certified Public Accountant Wisconsin, 1985, and Illinois, 1980 Honors, activities, and publications
  • IRS Commissioner’s Award


  • University of Wisconsin, Whitewater, BBA 1973

Professional memberships

  • American Institute of Certified Public Accountants
  • Wisconsin Institute of Certified Public Accountants
  • Association of Former IRS Special Agents