Garrison Smith was born on October 9, 1991 in Marietta, GA and attended Frederick Douglass High in Atlanta, GA. As a true freshman he appeared in seven games, recording three tackles and one tackle for loss. He also earned SEC Academic Honor Roll. He started two of 14 games as a sophomore at defensive end, tallying 22 tackles, three for loss and four quarterback hurries. He earned a spot on the SEC Academic Honor Roll for the second consecutive year. As a junior he started eight of 14 games at defensive end, recording 57 tackles, two tackles for loss, one sack, one fumble recovery and nine hurries. As a senior he started all 13 games at defensive end, recording 63 tackles, 10 for loss, six sacks, two fumble recoveries and 12 hurries. He was named SEC Academic Honor Roll for the third time. He was originally signed by the Miami Dolphins as an undrafted free agent following the 2014 NFL Draft.
Signed by Miami Dolphins on May 12, 2014 ... Cut by Dolphins on August 30, 2014 ... Re-signed by Dolphins to their practice squad on September 1, 2014 ... Cut by Dolphins on September 6, 2014 ... Signed by New Orleans Saints to their practice squad on November 27, 2014 ... Cut by Saints on December 16, 2014 ... Signed by San Francisco 49ers to their practice squad on December 23, 2014 ... Re-signed by 49ers on December 30, 2014 ... Cut by 49ers on September 5, 2015 ... Signed by 49ers to practice squad on September 6, 2015 ... Re-signed by 49ers on January 5, 2016 ... Cut by 49ers on September 3, 2016 ... Signed by Seattle Seahawks on September 4, 2016 ... Placed on injured reserve by the Seahawks with an oblique muscle injury ... Cut by Seahawks on September 2, 2017 ... Re-signed by Seahawks to their practice squad on September 3, 2017 ... Promoted by Seahawks to their roster from practice squad on September 19, 2017 ... Cut by Seahawks on November 28, 2017 ... Re-signed to Seahawks practice squad on December 5, 2017 ... Promoted by Seahawks to active roster on December 12, 2017 ... Signed by Atlanta Falcons on April 17, 2018.
Signed a one-year deal with the Falcons in 2018.