Niizawa started his career at Hakuhodo in 2001, and joined TBWA\Hakuhodo in 2007. After spending a year at TBWA\Chiat\Day in Los Angeles, he returned to Japan to become Creative Director for Apple at TBWA\MAL. In 2012, he returned to TBWA\Hakuhodo to lead creative teams for Nissan, ADIDAS and IKEA. In 2019, Niizawa joined Wunderman Thompson Tokyo as CCO.
His experience covers truly global brands, as well as traditional domestic clients, helping him develop a strong ability to provide creative solutions for global brands based on local insights and executions.
Niizawa took home the first Cannes Lions for NISSAN Japan, and has won several major Japanese advertising awards, including Creator of the Year. He was a member of the jury for Cannes Lions 2018 in a Film category.