Every season we see NFL head coaches come and go. And the 2012 campaign will be no different. Here are the newest coaches who have been hired and see who they replaced.

Schiano has spent the past 11 seasons as Rutgers' head coach, where he compiled a 68-67 record and was named Big East Coach of the Year in 2006. He served as defensive coordinator at the University of Miami from 1999-2000. From 1996-98, Schiano was an NFL assistant coach with the Chicago Bears. Who did he replace?

Crennel was named the Chiefs' permanent head coach after serving on an interim basis following the firing of Todd Haley during the 2011 season. He continues to serve as the team's defensive coordinator. He spent four seasons as head coach of the Cleveland Browns, compiling a 24-40 record and missing the playoffs each year. He also spent time on Bill Belichick's coaching staff as a defensive coordinator, helping to lead the New England Patriots to three Super Bowl titles. Who did he replace?

Fisher has been a head coach in the NFL for 17 seasons, all with the Houston Oilers/Tennessee Titans franchise. He reached the playoffs on six occasions — including a trip to Super Bowl XXXIV to end the 1999 season. Fisher has compiled a career record of 147-126. Who did he replace?

Pagano has spent the past four seasons with the Baltimore Ravens, serving as the team's defensive secondary coach for the first three before being promoted to defensive coordinator for the 2011 campaign. He was the defensive secondary coach for the Cleveland Browns from 2001-04 and the defensive backs coach for the Oakland Raiders from 2005-06. In 2007, he joined Butch Davis' coaching staff at North Carolina for one season. Who did he replace?

Mularkey spent the past four seasons as the Atlanta Falcons' offensive coordinator. He has had one stint as an NFL head coach, compiling a 14-18 record in two seasons with the Buffalo Bills before announcing his resignation. He also served as the Miami Dolphins' offensive coordinator and tight ends coach, as well as the Pittsburgh Steelers' tight ends coach and offensive coordinator. In Pittsburgh, he developed a penchant for trick plays. He started his NFL coaching career in 1994 as tight ends coach of the Tampa Bay Buccaneers. Who did he replace?

After coaching at the collegiate level for 19 years, Joe Philbin spent the past nine seasons with the Green Bay Packers, including the past five as the offensive coordinator. With Philbin as OC, the Packers ranked in the NFL's top 10 for points scored and total yards. He helped lead the team to a victory in Super Bowl XLV over the Pittsburgh Steelers. Who did he replace?

Allen spent the 2011 season as the Denver Broncos' defensive coordinator. During his coaching career, he has been known for his "bend but don't break" play calling. Allen was also a defensive assistant for the Atlanta Falcons from 2002-05 and New Orleans Saints from 2006-10. Who did he replace?