Office Building

Our Story

Jeff S. Mortimer, CPA LTD is a family owned and operated firm with a long history of providing excellent service to its clients. Jeff Mortimer has been working in the accounting industry for over 30 years, serving multiple industries and clients of all sizes. In the early 1990’s, he was working as a CFO for a mid-sized company in the central Illinois area when he decided to start his own public accounting firm, with the idea that he could provide more than the typical small-town tax preparer.

Using his experiences from his previous roles as a CFO, Jeff realized that he could provide similar CFO services to small or medium sized businesses that don’t have the need for a full-time CFO or don’t want to deal with the hiring process for an accounting team. Beginning in his basement and with the help of his wife, Kris, he made that vision come to life.

By the early 2000’s, the business had transitioned from a basement start-up to a small team in an office. Since then, we have continued to grow and expand the services we provide as well as our staff. Today, we specialize in a variety of tax, accounting, and consulting services. From the traditional tax preparation and planning for individuals and businesses, to bookkeeping or fully outsourced accounting and CFO function, we tailor our services to meet the unique needs of each of our clients.

As of the fall of 2020, the firm has expanded offerings by opening a second location in Osage Beach, Missouri. The Lake of the Ozarks area has been a favorite place for the family from the beginning, so it seemed a natural place to open a new office. We are now offering the same services we have always offered, now at both office locations and their surrounding areas.

Our Team

Jeff Headshot

Jeff Mortimer, CPA

Kris Headshot

Kris Mortimer
Office Manager

Amanda Headshot

Amanda Dorks, CPA
Senior Accountant

Our Service Areas


  • Auburn
  • Chatham
  • Springfield
  • Virden
  • Girard
  • Pawnee
  • Carlinville
  • Greater Central IL Area


  • Osage Beach
  • Lake Ozark
  • Camdenton
  • Sunrise Beach
  • Greater Lake of the Ozarks Area
  • Jefferson City
  • Columbia
  • St Louis