About Jonathan R
Jonathan R DeTrinis is an attorney licensed to practice in Louisiana and admitted to appear before the U.S. Court of Appeals for the Fifth Circuit. After completing his legal studies he entered practice in Louisiana and began building a practice that spans state and federal matters. He blends courtroom experience with appellate work and has developed a steady practice rooted in litigation.
Early in his career DeTrinis handled a range of civil cases in trial courts across the state. He spent time preparing cases for trial, conducting depositions, and drafting dispositive motions. Over time he increasingly took on matters that required appellate briefing and argument. That shift brought him into federal practice and into work that demanded careful attention to the record and to procedural nuance.
DeTrinis has taken appeals through the state system and into the federal courts. He has prepared appellate briefs and presented oral argument in appellate settings. Those engagements required a mix of legal research, persuasive writing, and courtroom poise. Colleagues and opposing counsel describe his approach as methodical. He favors clear written argument and a tightly organized presentation when cases move beyond the trial court.
His practice also touches on pretrial strategy and case evaluation. He evaluates whether matters are best resolved at the trial level or through appellate review. That assessment often shapes how he conducts discovery, frames issues, and prepares record materials that will serve both trial and potential appeal. He combines practical courtroom tactics with an eye toward the appellate consequences of procedural choices.
DeTrinis practices at DeT Law Office, LLC. There he manages client matters that arise in Louisiana courts and in federal proceedings before the Fifth Circuit. He represents individuals and entities in litigation that ranges from contract disputes to other civil matters that ultimately require appellate attention. He now focuses on civil litigation and appellate advocacy in Louisiana and before the Fifth Circuit.
