The agency has a pre-existing relationship with Nike in Germany.
Jim Elliott departs, and Arnold will go without a CCO. Havas previously promoted Jason Peterson to lead all of its North American creative teams.
In order for this new San Francisco agency to succeed, its creators knew it needed to be three things: fast, lean and famous.
Partners and executive creative directors Paco Conde and Beto Fernandez round out the office opened in June 2016.
The Starcom veteran will work on new business efforts and organic growth for the agency's existing client roster.
The goal is to raise awareness and funds for the refugee crisis, with proceeds benefiting the ACLU and the Refugee and Immigrant Fund.
The former Nike brand director succeeds Chris Kay, who will now lead the agency's international incentives.