About Stephen J.
Stephen J. Costello built his professional foundation on numbers and law. He earned a Bachelor of Arts in Accounting from the University of Northern Iowa in 1981. He then completed a Juris Doctor at Northern Illinois University in 1984. Those early choices set a steady course for a legal career rooted in Illinois practice.
After law school, Costello entered the Illinois legal environment and established himself as a practicing attorney. Over the years he has remained based in the state where he was trained and admitted. His background in accounting has shaped how he evaluates complex documentation and financial records in legal matters. He approaches factual detail in cases with a methodical eye.
Colleagues describe him as pragmatic and precise in his handling of client matters. He is comfortable in both the office and the courtroom. He tends to rely on careful preparation and a clear presentation of facts. That style reflects his academic training and decades of practice in Illinois law.
Costello is listed as an attorney at Costello & Costello, P.C. The firm carries his name and serves clients out of its Illinois office. His practice there has spanned many years. He has worked on matters that require scrutiny of accounting records, contracts, and regulatory filings, drawing on his undergraduate accounting education and legal training.
Outside formal biography details, Costello’s career shows persistence in maintaining a local practice rather than pursuing a national profile. He has stayed connected to the legal community in Illinois. That continuity gives him familiarity with state courts, local procedures, and the practical realities that clients face in regional matters.
Now in practice at Costello & Costello, P.C., he continues to represent clients in Illinois. He focuses his practice on matters that benefit from his combined accounting and legal background.
