TBWA\G1 hired Eric Pierre as executive European creative director. He will oversee all creative for the Nissan Europe account in more than 25 European countries. He also assumes the role of executive European creative director of Nissan United, the Omnicom agency unit dedicated to the Nissan account. Pierre began his advertising career at Ogilvy & Mather Paris as copywriter. He then joined Saatchi & Saatchi Paris, where he worked very closely with the London Office for international accounts like Sony, Toyota and Monster.com. In 2000, he joined Euro RSCG Morocco as senior copywriter for Citroen. In 2002, for Leo Burnett …