About Us

Based in St. Louis, Missouri since 2013, we have been providing professional and reliable bookkeeping services for hundreds of businesses, non-profits,s and individuals.


Meet Our Specialist

We Have a Team of Certified, Experienced and Trustworthy Financial Professionals

Mary, owner at Mullendore CPA

Mary Mullendore

A graduate of the University of Illinois – Champaign-Urbana from which she obtained a Finance degree with Honors. She also holds an MBA with a concentration in Finance from the University of Wisconsin – Madison. Mary is licensed as a Certified Public Accountant in Missouri and has also been awarded Certified Management Accountant Credential. She is currently PTIN/EFIN registered with Internal Revenue Service and has been a practicing CPA in the Greater St. Louis area since August 2006.

In February 2012, she opened her own CPA office in Kirkwood. Previously, she held various accounting and finance positions, including Securities Analyst for Texas State Securities Board and Divisional Financial Analyst and General Accountant for a local manufacturer. Mary served 5 years as controller for a national non-profit organization. Mary has multiple years of tax and small business experience as a CPA with a small firm in southern Illinois

Mary is continually committed to various philanthropic efforts and has served such organizations generously over the years. She served as Treasurer for the Kirkwood School District Foundation. She has been strongly involved in Sign of the Arrow, a St. Louis area philanthropic needlepoint and giftshop for over 20 years. She served seven years on the Board of Directors including five years as President and two years as Chairman. Mary is a member of the P.E.O. Sisterhood, an organization committed to advancing women in the area through their educational goals. She served on the Executive Board of the St. Louis Reciprocity Chapter for two years as well as President and Treasurer for her local chapter.

Mary, originally from Wisconsin, is a resident of Kirkwood, Missouri where she raised her three children with her husband and their Labrador Retrievers. She enjoys spending weekends with her family on property near Mark Twain Lake.



Accounting Assistant



Bookkeeping & Payroll






Administrative Assistant

A Reputation for Excellence

We have over 17 years experience helping business owners with custom accounting and bookkeeping solutions. We put our emphasis on helping our clients do what is in their best interest. Our client’s needs always come first.




From our clients


Mary is a vital part of my business support system. I have been using her services since I opened in 2013. Mary is very professional and knowledgeable. Her staff is also very friendly and they are prompt in answering any questions or concerns that I have. I highly recommend her services.

Laura White

Mary knows her stuff, and has done a great job for me and the clients I have sent to her. On top of that, she and her staff are all very nice to deal with

Fredrick Koury

Mary has helped me with both my personal and business taxes and accounting. She is extremely efficient and helpful in answering all my questions that always seem to come up.

Matt Buck


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