Greg Hahn is the Co-Founder and CCO of Mischief @ No Fixed Address. In less than four years, Greg has taken the agency from a pandemic start-up to the most in-demand agencies in the US and beyond. Mischief has earned Ad Age A-List #1 Agency of the Year in 2022 and again in 2024, AdAge Creative Agency of the Year 2024. Adweek US Agency of the Year Award 2023 and 2025, Campaign US Agency of the Year 2022 and 2023, and the only agency to be among GQ's Most Creative Companies in the World 2024. In 2024, Greg was named Adage’s Chief Creative Officer of the Year and Campaign Magazine Creative Person of the year.

Prior to founding Mischief @ No Fixed Address, Greg was the Creative Vice Chairman of BBDO Worldwide and the Chief Creative Officer of BBDO New York. During his time leading BBDO he helped the agency earn the title of the most awarded in the world according to The Gunn Report multiple times. Greg has also been named one of the “100 Most Creative People in Business” by Fast Company Magazine and top 10 Creative Directors by Adweek. As a writer and Creative Director, Greg has won practically every advertising award there is, including multiple Grand Prix at Cannes and Best of The Decade at The One Show and two Emmys.