Terry Geoghegan was born and raised in County Galway, Ireland and received his college education locally at University College of Galway. His Irish legal studies were completed at the Incorporated Law Society of Ireland, Dublin. He later received his Juris Doctor Degree from the John Marshall Law School, Chicago, and subsequently was admitted to practice law in Illinois.

He has successfully tried several Cook County Law Division cases involving medical negligence, products liability, construction and automobile negligence.

Terry is a member of the Illinois Trial Lawyers Association (ITLA), where he served as co-chair of the Medical Negligence Committee. He is also a member of the Chicago Bar Association, the Illinois State Bar Association and the Association of Trial Lawyers of America, now the American Association for Justice (ATLA/AAJ).

He has been invited to lecture to several groups, including the Illinois Institute for Continuing Legal Education and the Illinois Trial Lawyers Association. He has also lectured on the subject of the Brehon Law to members of the Irish American Heritage Center and to the Brehon Societies of several Chicago-area law schools.