Demetrius Douglas grew up on the Southside of Atlanta. He attended Lakeshore High School in College Park, where he received All-American honors for his play on the football field and the basketball court. Upon graduating high school, Demetrius attended the University of Georgia as a Defensive Linebacker under legendary coach Vince Dooley. While at UGA, he received All-American honors in football and was later inducted into the UGA Football Hall of Fame. He graduated with a Bachelor of Science in Education and a minor in marketing. Following his graduation from UGA, he briefly played for the New York Jets, Washington Redskins and the Calgary Stampeders. 

After retiring from professional football, Demetrius entered the finance profession as a mortgage broker and later the real estate profession. He excelled in the mortgage industry for 15 years, during which, he spent the last five years as a successful entrepreneur. In addition to his work as a real estate investor, Demetrius has a heart for the youth and has coached football at Arlington Christian School, Henry W. Grady High School, Lovejoy High School, and is currently coaching defense at Dutchtown High School. On top of his many professional pursuits, he is heavily involved in his community and enjoys motivating youth to be the best they can be. As a servant-leader, Douglas is an active member of Word of Faith Family Worship Cathedral, where he serves as a deacon.

Demetrius was first elected to the Georgia House of Representatives in July 2012. He represents the citizens of House District 78, which includes parts of Clayton and Henry counties, specifically the Jonesboro, Morrow, Stockbridge, and McDonough areas.

Demetrius believes his proudest achievement is the establishment of his family. He and his wife Veda have been married since 1998. They reside in Henry County with their two daughters, Destiny and Demi.