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Issues with servers, computer and software updates can create unproductive and costly downtime.  Phishing attacks and breaches are the becoming the biggest threat to a business’s ability to work, be profitable and continue to function as a company.  ECT has been helping businesses and individuals to navigate the ever changing world of technology and cyber security.  Contact ECT to see how they can proactively strengthen your network and reduce IT downtime.

Milestone Anniversaries

We would like to recognize the following employees for their continued dedication to our firm:

               Amanda Ryan - 15 Years

               Michelle Vicencio - 15 Years

               Rachael Lesperance - 5 Years

               Simona David - 5 years

               Chase Blazier - 5 Years

Thanks to these outstanding individuals for their excellent work through many tax and audit seasons.

Founding Partner,

John Eder, Retires

After an exceptional career and 30 years as the founding partner of Eder, Casella & Co., John Eder retired December 31st, 2019.  John’s leadership and career were celebrated well with parties and many well wishes from the staff and clients he’s worked with over the years.


Although it’s business as usual for the firm as we gear up for our 31st tax season, John will truly be missed.  John’s excellent head for business, his loyal heart of gold and his hilarious sense of humor make him truly memorable.  “He taught me how to let go and give other people an opportunity to shine. I hope to never lose sight of that” said managing partner Shelly-Casella Dercole. We are happy to see him be able to enjoy this next phase of life. 

Over the last year, John did a great job teaching and advising the staff who have already transitioned into working with his clients. We look forward to continuing our commitment to serving our clients well in the new decade.  

Broman & Kosar, Ltd. Merges with Eder, Casella & Co. 

Eder, Casella & Co., Certified Public Accountants, announced the merger of the Crystal Lake office of Broman & Kosar, Ltd. with Eder, Casella & Co. on November 1, 2017.  The combined firm is conducting business as Eder, Casella & Co.


“The combination of Melissa (Mickey) Broman’s depth of tax knowledge and expertise in business valuations will present our clients with more of what they’ve always looked to us for - expert advice and timely, efficient service that is honest reliable and friendly”, said Shelly Casella-Dercole, Managing Partner of Eder, Casella & Co. 


 “I welcomed the opportunity to merge with a larger firm that could offer my clients an expanded menu of services while keeping a strong and consistent commitment to client services” said Mickey Broman, founding partner of Broman & Kosar, Ltd.



Our Gurnee Office is officially open at 6071 Washington St.

in Gurnee.  We are in the front of the new Honey Orthodontics building.  

 Nancy Gonsiorek joins Eder, Casella & Co.





Eder, Casella & Co. is pleased to announce that Nancy Gonsiorek, CPA, joined the certified public accounting firm on January 2nd, 2019 as a Senior Manager.  Nancy has been a Certified Public Accountant for over 25 years and most of her work experience has been in public accounting.   She began her career and worked for many years with KPMG Peat Marwick in both audit and tax consulting positions.  She has also worked for both local and regional Certified Public Accounting firms in the northwest suburbs.  Nancy has owned and operated her own firm, Nancy L. Gonsiorek, CPA, LLC, for the past 11 years, providing audit, tax and management advisory services for tax-exempt organizations in McHenry County and beyond. “We are very pleased to welcome Nancy to the firm”, stated Shelly Casella-Dercole, Managing Partner of Eder, Casella & Co.  “Her extensive knowledge and passion for Not for Profit organizations will make her a great asset.”


Nancy places a strong emphasis on improving the quality of nonprofit governance in our community.  To this end, she serves on the nonprofit committee of the Illinois CPA Society, providing guidance in the area of nonprofit auditing, accounting, compliance and governance to CPAs and nonprofit leaders all over the state of Illinois.  Nancy also serves on the ICPAS Content Advisory Committee which is charged with organizing and planning nonprofit and uniform guidance CPE conferences and workshops for Society members.  In 2018, Nancy received the Distinguished Service Award for her service to the Society.



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5400 West Elm Street

Suite 203

McHenry, IL 60050

(815) 344-1300

(815) 344-1320 Fax


760 West Main Street

Suite 100

Barrington, IL 60010

(847) 382-3366

(847) 382-0608 Fax


Monday - Friday

8:00 AM - 4:30 PM


Monday - Friday

9:00 AM - 4:00 PM


6071 Washington Street

Unit B

Gurnee, IL 60031

(847) 336-6455

(847) 336-9594 Fax


Monday - Thursday

8:00 AM - 4:00 PM

Friday 8:00 AM - Noon

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