About Jonlyn Jonlyn & Associates is a full service tax, accounting and financial services firm practicing in Wheaton, Illinois. We cater to a wide variety of clients ranging from individuals to medium-sized corporations. Our staff accountants and CPA's specialize in retirement planning, new business consulting, and personal financial planning. Of course, in addition to our specialty areas, we also provide tax and accounting services, including tax planning and tax return preparation, auditing, and bookkeeping. Jonlyn & Associates is a member of the Illinois CPA Society and the American Institute of Certified Public Accountants, the Wheaton Chamber of Commerce, the Warrenville Chamber of Commerce, and the Winfield Chamber of Commerce. Mission Jonlyn & Associates, a Wheaton based Certified Public Accounting firm, assists local area business and professional individuals in all tax and financial matters to provide the tools and knowledge for their continued success. History John V. Pezzullo, CPA and Linda G. Pezzullo, CPA commenced operations as Jonlyn & Associates in 1991. Over the years, the firm has grown steadily and rapidly, and now has six professional accountants to service a continuously growing clientèle of Businesses and Individuals. Today, with active practices in accounting and auditing, tax planning and preparation,  and small business consulting, Jonlyn & Associates has evolved into a full-service accounting and consulting firm serving the greater Chicagoland area, specifically DuPage County.  But we do not stop at the state boundaries.  We currently provide services in over 46 states.