John G. Costello joined Costello & Edwards in 2016 after spending nearly five years as an Assistant State’s Attorney in Montgomery County. John’s primary practice areas are personal injury and criminal defense.
As an Assistant State’s Attorney, John gained invaluable court experience trying cases before judges and juries on a regular basis. An experienced litigator, John prides himself on knowing what it takes to succeed at trial and preparing his clients accordingly.
Whether you have been injured due to the negligence of another or are facing criminal charges, John is an experienced, compassionate attorney who will fight to protect your rights.
John graduated from Gonzaga College High School in Washington, D.C. He received his bachelor’s degree from the University of Delaware and law degree from American University, Washington College of Law. John is an admitted member of the Bars of Maryland, the District of Columbia, and the United States District Court for the District of Maryland.
Professional Affiliations
- Prince George’s County Bar Association
- Montgomery County Bar Association
- District of Columbia Bar Association
- Maryland State Bar Association