John Shannon has been practicing law since May 1975. For the past 25 years, he has practiced extensively in the area of injury cases, both personal injury and death. He is a member of The Florida Bar and a previous member of The Alabama Bar. He is also a member of the United States District Court for the Middle District of Florida, a member of the United States Circuit Courts of Appeal for both the Fifth and Eleventh Circuits. He is also a  member of the United States Supreme Court, which requires a member in good standing to request and certify competency of the attorney, moving the Court for a lawyer to be admitted before admission is allowed.

It has been expressed by others that Mr. Shannon has a reputation for being a good lawyer, and a formidable adversary worthy of respect, who is not afraid to take on difficult cases. He is respected among defense attorneys with whom he regularly litigates and is noted for his legal abilities and persistence. Mr. Shannon works diligently, regardless of the complexities of a case, to achieve good results, and will advance the cost funds and time needed to successfully prevail in cases.

Mr. Shannon has personally handled numerous appeals in the last 25 years. Mr. Shannon has orally argued appeals in both State and Federal Courts. Currently, he has the landmark case in the Eleventh Circuit on the issue of attorney fees as it relates to discharge ability under the Bankruptcy Act. He successfully reversed the Senior Bankruptcy Judge's decision in the United States Bankruptcy Court for the Middle District of Florida in Tampa. The judge is considered to be one of the experts on Bankruptcy in the country and teaches the subject regularly to law students.