In her new role, Cooper (right) will be assisted by the former senior producers, Clare Donald (left) and Sarah Patterson (centre), who have been promoted to joint deputy heads of TV production.
Cooper will manage a 28-strong team servicing UK and global clients.
She will also work closely with Nick Bell, JWT's executive creative director.
Cooper has worked at JWT for 15 years and was promoted to deputy head of TV in 2002. Before that, she was a senior producer. She has held senior producer positions at Abbott Mead Vickers BBDO and Lowe Howard-Spink.