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Mazzoni and Associates is a full-service Certified Public Accounting firm licensed in IL. All our CPA's hold valid IL State CPA Certificates.

Meet Our Staff:


Steve Mazzoni, CPA, MST  

Steve has over 35 years of experience assisting individuals and small businesses with their accounting and income taxes. He is a QuickBooks Proadvisor serving numerous small businesses using both the desktop and the online versions of QuickBooks. Steve has a master’s degree in Federal income taxation, and regularly handles tax issues ranging from routine to complex. Steve lives with his family in Arlington Heights, and enjoys spending time with his family, playing tennis, tending his flower garden, and spending time with friends.




 John Manella, CPA, CFE  

John has over 25 years of experience assisting individuals, small businesses and exempt organizations with their income taxes and accounting.  He also holds the professional designation of Certified Fraud Examiner.  John retired from a career in law enforcement prior to joining the firm.  In addition to accounting, his background includes experience as a Police union president, pension board trustee, investigator and evidence technician.  He is also currently a Board member of the Special Agents Association.            



Kathy Mazzoni, CPA  

Kathy brings 29 years of auditing experience including 20 years specializing in condominium associations and not for profits.  Prior to joining the firm, Kathy worked in audit for local, national and international firms.  She has the proven ability to understand the issues her clients face every day and being able to offer them solutions.  Her years of experience, coupled with her attention to detail and client service are why she consistently maintains long-term relationships with her clients.  Kathy lives with her family in Arlington Heights and enjoys spending time with them, traveling and reading.