Haley is well-known for his fiery style and this may rub some players and coaches the wrong way. However, he is also a good offensive mind who will help push the Steelers in the right direction offensively.
While with the Chiefs, Haley had one of the best rushing attacks in the league, including the top rushing attack in 2010 behind Jamaal Charles and Thomas Jones. Though he never had a an elite offense in Kansas City, he did focus the offense around the team's strength which was running the ball.
That does not mean Haley isn't willing to open up the offense. At one point while in Arizona, he coached the worst rushing offense in the league, but that was because he had Kurt Warner and Larry Fitzgerald to work with.
Under Whisenhunt, Haley began to call plays late in the 2007 season before taking over full-time in 2008 when he helped direct an explosive Cardinals' offense.
The 2008 Cardinals finished second in the league in passing (292.1 ypg) and set a franchise scoring record with 26.7 points per game, which ranked third in the league. They ranked seventh in scoring in 2007.
It is this type of production that the Steelers will expect from their offense next year and why Haley will now be in control of their offense.
Here is who will benefit from the presence of Haley at offensive coordinator.