[2] Bloodsport, Fist of Fury and The Way of the Dragon were some of the films that inspired Douglas Brose to learn about and train some martial art.

[11] At the 2013 World Games held in Cali, Colombia, he won the silver medal in the men's kumite 60 kg event.

[17] Brose won the gold medal in the men's kumite 60 kg event at the 2021 World Karate Championships held in Dubai, United Arab Emirates.

[22][23][24] Brose won the silver medal in the men's kumite 60 kg event at the 2022 World Games held in Birmingham, United States.

[25][26] At 37 years old, he competed in the last fights of his career at the 2023 Pan American Games in Santiago and said goodbye after winning the bronze medal.