As content material turns into an more and more necessary a part of the company’s enterprise, Adweek U.S. Media Company of the 12 months Wavemaker turned to a GroupM veteran to guide the apply within the U.S. Wavemaker appointed Valeria Mares as Wavemaker U.S head of content material, efficient instantly. “Our content material apply has tripled up to now yr,” Wavemaker CEO, Americas…