Jason Garrett's time away from the NFC East was short-lived.
The 53-year-old will serve under first-year head coach Joe Judge, who earned the top job in New York after eight years with the New England Patriots.
Garrett's experience could prove valuable, as Judge has never been a head coach at any level.
Dallas opted not to renew Garrett's contract after the club finished 8-8 and outside the playoffs. He had served as head coach for nine seasons and had been with the Cowboys since 2007.
Garrett, a former quarterback, spent four years of his playing career (2000-03) with the Giants.
He'll be tasked with leading a young unit that flashed promise in 2019 but still needs significant improvement. The Giants tied for 18th in scoring offense, 19th in third-down percentage, and 24th in total yards per game.
Most importantly, Garrett will oversee the development of quarterback Daniel Jones, who had an uneven rookie season. The 2019 first-rounder racked up 3,027 yards and 24 touchdowns in 13 appearances (12 starts) but struggled with turnovers, throwing 12 interceptions and losing the most fumbles in the league (11).
The former head coach called plays in Dallas until Scott Linehan became offensive coordinator in 2015. Kellen Moore was the play-caller this past season, as Dallas finished first in yards per game and sixth in points per game.
New York also named Patrick Graham defensive coordinator and Thomas McGaughey special teams coordinator. Graham coached the Giants' defensive line from 2016-17 and led the Miami Dolphins' defense last season. McGaughey, meanwhile, retained the position he's held since 2018.