[1] Smith attended Georgetown Preparatory School in North Bethesda, Maryland, where he played on the offensive line and was team captain.

Mid-way through the 2015 season, Whisenhunt was fired and replaced by tight ends coach Mike Mularkey.

[4] On January 21, 2019, Smith was promoted to offensive coordinator, replacing Matt LaFleur, who departed to become head coach of the Green Bay Packers two weeks prior.

Smith was praised for his play-calling in the Titans' 28–12 road victory over the top-seeded Baltimore Ravens in the AFC Divisional Round.

Two weeks later, Smith received his first career win as a head coach in a 17–14 victory over the New York Giants.

[10] In his second season, Smith led the Falcons to another 7–10 record as the team finished fourth in the NFC South and did not qualify for the playoffs.

[11] Smith was widely criticized by various media outlets throughout the 2023 season for failing to utilize highly drafted players such as tight end Kyle Pitts, wide receiver Drake London, and running back Bijan Robinson.

[12] This also extended the Falcons streak of missing the playoffs to six straight seasons, resulting in Smith's firing on January 8, 2024.

[16] Smith and his wife, Allison, reside in Atlanta, Georgia, with their three children, Tanner, Sophie, and William.