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John Hennessy is a Senior Manager at DHJJ with over 30 years of public accounting experience plus two years as a practicing attorney. His clients include a variety of service professionals, business owners, and fiduciaries. His expertise includes tax planning and compliance, research of complex issues an nd
representation of clients before the IRS and state taxing authorities.

With practical and theoretical knowledge of tax issues, John primarily focuses on income, estate, and gift tax matters. He often coordinates income tax planning for individuals with their closely held businesses and assists with decedents’ final returns and their initial trust and/or estate return filings.

John is a former member of the American Bar Association, the Illinois State Bar Association, and the DuPage County Bar Association and was recognized for his legal skills with two American Jurisprudence Awards while studying at DePaul.

A native of Naperville, John earned his Bachelor of Business Administration from the University of Notre Dame, followed by Juris Doctor and Master of Laws in taxation degrees from the DePaul University College of Law.

Outside of Work:

Away from the office, John enjoys swimming, fishing, cross-country skiing, and occasionally

He is a devoted Notre Dame football fan and a eucharistic minister.

He and his wife, Annette, reside in Naperville.


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630 420 1360