Trammell attended the University of Georgia for his undergraduate education where he majored in English and Political Science.

[3] Trammell was first elected to the Georgia House in 2014, succeeding Carl Von Epps, who did not run for reelection.

[4] In 2017, Trammell became the minority leader of the Georgia House, succeeding Stacey Abrams, who resigned to focus on her gubernatorial campaign.

[5][6] In the 2017 legislative session, Trammell served on four committees (Government Affairs, Judiciary, Information & Audits, and Motor Vehicles.[4]).

After the 2018 elections, Trammell became the only House Democrat to represent a seat that voted for both President Donald Trump and incoming governor Brian Kemp.