Jon Mrowiec
(847) 580-5407

Jon is a valued member of the CJBS team. He has been with the firm since 2018 and currently serves as an associate in the CJBS Tax Department. Prior to joining the firm, Jon spent 25 years trading S&P 500 options with CME Group. He also spent 10 years as a pilot with the Air National Guard.

While in pursuit of his MBA, Jon was exposed to accounting. He discovered that he enjoyed the field and started the classwork to complete his accounting degree upon earnings his MBA. Jon’s time in the Air Force taught him attention to detail and hard work—skills that he now puts to good use in his accounting career.

Raised in Park Ridge, Illinois, Jon currently lives in Spring Grove with his wife, who he met in college. Together they have seven children. Outside of the office, Jon spends a lot of his free time coaching his children’s sports teams.



  • Millikin University
    • Bachelor of Science in Marketing (1982)
  • University of Illinois Urbana-Champaign
    • Master of Business Administration (2011)