Bettcher, 39, comes to the Giants after five seasons with the Arizona Cardinals, the last three as defensive coordinator. In those three years, the Cards' defense was consistently among the NFL's best in yardage allowed, ranking fifth in 2015 (321.7), second in 2016 (305.2) and sixth in 2017 (310.9). Arizona was also one of the league's most effective run-stopping units each season, finishing, respectively, sixth (91.3), ninth (94.9), and sixth again (89.6). In 2016, Bettcher's defense led the NFL with 48 sacks. Last season, the Cards took down opposing quarterbacks 37 times, including an NFL-leading 17.0 sacks by Chandler Jones.

Before being promoted to coordinator, Bettcher spent two years coaching Arizona's outside linebackers. He entered the NFL in 2012 as the Indianapolis Colts' special assistant to the head coach/outside linebackers coach. He also coached on the collegiate level at the University of St. Francis, Bowling Green, North Carolina, Ball State, and New Hampshire.

"James coaches a defense that's hard to score against," said Shurmur. "He had great success in Arizona, and we're certainly glad to have him here."

Emanuel, 59, is a 37-year coaching veteran who spent the previous six seasons as the defensive line coach of the Indianapolis Colts. In 2017, Emanuel's group included former Giants tackle Johnathan Hankins, who recorded 44 tackles and two sacks.

Emanuel was also the San Francisco 49ers' defensive line coach in 2005-06. After leaving the Niners, he spent one season at San Jose State, two at Rutgers, and two at Purdue University, where he was the defensive coordinator and line coach in 2011. Emanuel began his coaching career at Plymouth State University in 1981.

Anarumo, a 51-year-old Staten Island native, was the Miami Dolphins' defensive backs coach from 2012-17. In the recently-completed season, strong safety Reshad Jones led the Dolphins with 122 tackles and was selected as a starter on the AFC Pro Bowl team. Cornerback Xavien Howard was one of the 25 NFL players with at least four interceptions, including one he returned 30 yards for a touchdown. Before joining the Dolphins, Anarumo spent eight years as the defensive backs coach at Purdue, where he worked with Emanuel in 2010-11.

McGovern, 55, is preparing for his third season as the Giants' linebackers coach. In 2017, he helped developed young backers B.J. Goodson and Calvin Munson, who together accounted for 108 tackles despite missing a combined 11 games because of injuries. In 2016, the linebackers contributed significantly to the NFL's most-improved defense. Jonathan Casillas, voted the Giants' defensive captain by his teammates, finished second on the team with 92 tackles (59 solo).

Prior to joining the Giants, McGovern spent three seasons as the Philadelphia Eagles' outside linebackers coach. He previously coached for 15 years in two stops at Boston College.

Townsend, 42, a former 13-year NFL player, is entering his fifth season as a pro coach. He spent the previous two years as the Tennessee Titans' secondary backs coach. Last season, Titans safety Kevin Byard tied Detroit's Darius Slay with an NFL-best eight interceptions. Byard was also third on the team with 87 tackles (62 solo). In 2016, Townsend's secondary intercepted 10 passes and had 71 passes defensed. From 2013-15, Townsend was the cornerbacks coach at Mississippi. In 2014, the Bulldogs led the nation with 89 passes defended. Townsend was the Arizona Cardinals' assistant defensive backs coach in 2011-12.

Townsend played 191 games with 80 starts for Pittsburgh (1998-2009) and Indianapolis (2010). He was on the Steelers teams that defeated Seattle in Super Bowl XL and Arizona in Super Bowl XLIII. Townsend was a four-year starter at the University of Alabama.

Leonard, 32, joined the Giants in 2013 as a defensive assistant. In 2017, he was the team's assistant defensive line coach. Before joining the Giants, Leonard spent three seasons as a graduate assistant at his alma mater, North Carolina State University.