In his new role, Koxvold will be responsible for leading creative development across all the agency's US clients, and will also work closely with its Stockholm and Amsterdam offices.
Koxvold joins Perfect Fools from his role as the creative director at Draftfcb New York. Before this, he was the senior art director at Ogilvy San Francisco.
His appointment comes soon after Perfect Fools appointed the former Wieden & Kennedy managing director Tom O'Kennedy as a non-executive director.