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DaiNell Consulting & Bookkeeping was founded by Maryann O'Connor is 2007 after spending over 30 years working with small businesses. She holds an MBA degree from Bentley University and is a QuickBooks Pro-Advisor.


Maryann brings a wealth of knowledge to her clients.  She has been a Certified ProAdvisor with QuickBooks since 2007 but has been using Intuit products and managing small business finances for decades.  Her combination of QuickBooks expertise, a strong knowledge of accounting, and extensive hands-on experience (not to mention her casual, reassuring training style) has made her services highly valued.

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Meet the Team


Account Manager


Janellen has been working with the firm for the past 12 years, learning on the job while still in high school and growing into a true professional. She has become invaluable to the firm and continually impresses her clients with her skill, reliability and strong attention to detail. 

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Marie joined the firm in 2018 after a career change.  She has become a very dedicated part of the team and brings a sharp eye for detail to every file she works on.  Got a deadline? Marie will drop everything to ensure that we meet it!


 “Maryann O’Connor at DaiNell Consulting & Bookkeeping is truly world class.  She’s expert, accessible, and a delight to work with.  I’ve had nothing but great experiences using her for my business.  Plus, she seamlessly supports QuickBooks on all of my Macs!”                                                                                         Jeffrey Korn / Creative

“I have been exclusively using QB for both accounting and time & billing for the last eight years.  I’ve had great help from my outside bookkeeper, Maryann O’Connor, who enthusiastically plunged into the task of making QB work reasonably well for law firm time & billing needs and now has a tremendous amount of experience in this area.”                                                                     Jon Klavens, Klavens Law Group

“Maryann has been a great resource.  She has trained the staff and simplified our accounting so that we have better reporting.  She has made a discernible difference.”


Brooks Sullivan

Treasurer, Longwood Covered Courts


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