Jim Leonhard's journey in professional football began when he entered the NFL as an undrafted free agent. Despite not being selected in the 2005 NFL Draft, Leonhard's determination and skill earned him a spot with the Buffalo Bills. His time with the Bills allowed him to showcase his abilities as a safety and special teams player, where he quickly became known for his intelligence on the field and his ability to read the game effectively.

After spending three seasons with Buffalo, Leonhard signed with the Baltimore Ravens in 2008. It was with the Ravens that he truly began to gain recognition for his defensive prowess. Under the guidance of defensive coordinator Rex Ryan, Leonhard thrived in Baltimore's aggressive defensive scheme. His performance during the 2008 season, including a memorable playoff run, highlighted his ability to make crucial plays and solidified his reputation as a reliable safety.

In 2009, Leonhard followed Rex Ryan to the New York Jets, where he continued to excel in a familiar defensive system. His tenure with the Jets was marked by consistent performances and leadership on the field. Leonhard's understanding of the game and his ability to communicate effectively with teammates made him an integral part of the Jets' defense. He played a key role in helping the team reach the AFC Championship Game in both the 2009 and 2010 seasons.

Leonhard's career, however, was not without challenges. Injuries, including a broken leg in 2010 and a torn patellar tendon in 2011, tested his resilience. Despite these setbacks, he managed to return to the field and continue contributing to his teams. After his time with the Jets, Leonhard had brief stints with the Denver Broncos, New Orleans Saints, and Buffalo Bills once again.

In 2013, Leonhard joined the Cleveland Browns, where he reunited with former Jets defensive coordinator Mike Pettine, who was then the head coach of the Browns. His experience and knowledge of Pettine's defensive schemes proved valuable, and he played a significant role in mentoring younger players on the team.

Leonhard's final season in the NFL was with the Browns in 2014. After a decade-long career, he announced his retirement from professional football.

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