Schofield, a five-year veteran, joins the Falcons after two years with the Seahawks, where he had 22 tackles, three sacks and one fumble recovery in 31 games.
Schofield, who turns 28 in April, was selected in the fourth round of the 2010 NFL draft by the Arizona Cardinals. In 66 total games over five seasons, he has 86 tackles, 13.5 sacks and two forced fumbles. In five career playoff games, including Seattle's 2013 Super Bowl win, he has six tackles.
Schofield also has familiarity with new Falcons head coach Dan Quinn from Quinn's time as Seattle's defensive coordinator during the 2013 and 2014 seasons.
The Falcons finished last year 6-10 and in third place in the NFC South. The team closed the season ranked 27th in points allowed and 32nd in yards allowed.