About John Larsen
John Larsen Mulvihill earned his undergraduate degree from the University of South Alabama in 2001 and completed his J.D. at Stetson University College of Law in 2004. Those years shaped his legal foundation. He moved from law student to courtroom practitioner in a relatively short span, carrying the practical training and academic rigor of Stetson into his early work.
After law school Mulvihill built a practice rooted in Florida. He holds membership in The Florida Bar and is authorized to appear before the U.S. District Courts for the Southern and Middle Districts of Florida. He has been a member of the Hillsborough County Bar Association since 2013. That combination of state and federal admissions informs how he manages cases today.
In 2021 he joined and began practicing under the firm name Thacker and Mulvihill, PLLC. The firm listing reflects a shift to a smaller, attorney-led practice model. Clients find a different pace there than at larger firms. The office structure allows more direct attorney-to-client contact and consistent handling of filings in both state and federal dockets.
Mulvihill’s work is shaped by courtroom experience and procedural practice in Florida courts. He regularly handles filings in state venues and appears in the Southern and Middle Districts of Florida when federal jurisdiction applies. His legal background is practical; he focuses on moving matters through the system and on clear, direct advocacy rather than headline-grabbing litigation strategies.
Outside of casework, Mulvihill maintains ties to the local bar. His long-standing membership in the Hillsborough County Bar Association places him among local colleagues who exchange information about practice developments and court procedures. He also keeps active membership in The Florida Bar, which connects him to statewide rule changes and continuing legal education offerings.
Colleagues describe Mulvihill as methodical in preparing documents and attentive in court appearances. He favors straightforward arguments and careful adherence to court rules. He currently practices at Thacker and Mulvihill, PLLC, representing clients in matters filed in Florida state and federal courts.
