The Dolphins are off to a fast start at the Senior Bowl this week, filling their lone open coaching position by hiring Mark Duffner as the new linebacker coach, according to a report by the Florida Times-Union.

Duffner, 60, has been the Jacksonville Jaguars linebacker coach under three different head coaches -- Jack Del Rio, Mike Mularkey and Gus Bradley. He's been with the Jaguars since 2006.

He worked for the Packers in the mid 2000s when Dolphins head coach Joe Philbin was on that same staff thus the familiarity.

Duffner has 17 seasons of NFL experience thus making him the Dolphins coach with the most NFL experience.

Duffner is formerly the head coach at the University of Maryland. He coached the Terps from 1992-96. Prior to that he was the head coach at Holy Cross.

As Duffner was also the linebacker coach for the Jaguars, this suggests he was either out of contract or the Dolphins will make him an assistant head coach as well.