O'Brien joined Aegis Media in September 2010 to take leadership of its multinational clients in the region, including Nokia, adidas, Philips, Beiersdorf and Fox. During his time as CCO, he has helped steer growth and has won regional clients Expedia, Air Asia and Clarins. He has also built a strong team by attracting senior talent in Singapore and Hong Kong.
In his new capacity, O'Brien will take charge of more than 1,900 people in 35 offices across 15 countries.
"O'Brien is a proven international operator around the globe, with extensive Asian experience," Waters said. "Since joining Aegis Media he has brought great focus to our multinational clients and contributed significantly to our new business success. Carat has good momentum in Asia Pacific and will build on that under Sean's leadership.”