Pettine said he received several calls from mutual friends urging him to go work for Marrone.
Under Pettine, New York's defense has not ranked lower than eighth in the NFL in yards allowed.
The Bills are switching to a hybrid 3-4 scheme under Pettine, the former New York Jets defensive coordinator.
Dennis Thurman replaced Pettine as the team's defensive coordinator when Pettine took the same role with Buffalo this offseason.
They have questions at linebacker, particularly with the defense reverting to a 3-4 scheme under new coordinator Mike Pettine.
But then game day arrives, and all of the technologically advanced tools of Pettine's profession go in a drawer.
Scott has known Pettine since his high school playing days in suburban Philadelphia.
Pettine said it's too early to declare what schematic changes he may implement.
New defensive coordinator Mike Pettine plans on installing a hybrid defense that attacks opposing quarterbacks, which could play to Byrd's strengths.
Pettine plans on installing a pressure defense that attacks opposing offenses, which the Bills hope will lead to more opportunities for turnovers.
Pettine was more forthcoming about the attacking style the Bills will play.
Alonso will compete for a starting job in a revamped defense that's making the switch to a 3-4 system under new coordinator Mike Pettine.
The additions of Williams and Meeks give new defensive coordinator Mike Pettine more options to work with as he attempts to overhaul Buffalo's defense.
Doug Marrone is the new coach and has brought in an entirely new staff that includes Mike Pettine, who takes over as defensive coordinator.
Pettine now tracks nearly every aspect of his coaching life in Microsoft Excel, including the number of times his players run each play in practice.
Defensive coordinator Dennis Thurman, promoted from secondary coach to replace the departed Mike Pettine, didn't want to comment on trade speculation involving cornerback Darrelle Revis.
Pettine's challenge is to transform a defense that last season finished 22nd in yards allowed, while giving up 435 points, the second-most in team history.
Marrone has "always been an admirer" of Pettine's and that he boarded a flight to meet with him immediately after being introduced in Buffalo Jan. 21.
Scott is familiar with both Marrone and newly hired defensive coordinator Mike Pettine, who came to Buffalo after serving the same role with the New York Jets.
Ryan, a defensive coordinator in Baltimore before being hired as a head coach in New York, left most of those duties to Mike Pettine the last two years.
"I can't really speak on what happened here, " Pettine said.
Though it was unlikely the Bills were going to re-sign him, Merriman's retirement marks the latest change to the team's defense under new coach Doug Marrone, and new coordinator Mike Pettine.
Jets defensive coordinator Mike Pettine got onto Billick's staff in 2002 by getting someone to convert some 5, 000 play diagrams Billick had stored in an Apple format into a more easily transferrable program.
They had just 30 sacks, the 25th-most in the league, and many of those were born of the timely and creative blitz packages devised by head coach Rex Ryan and former defensive coordinator Mike Pettine.
Having spent the past four seasons with the Jets, Pettine says Friday in his introductory press conference that the talent level in Buffalo was one factor in his decision to switch teams two weeks ago.
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