Mottram previously held leadership roles with Allison+Partners, Text100 and Bite.
It is also structuring its international businses into creative, CRM, and media, and slashing its latest financial forecast to about US$57 million in profit.
S4Capital's board is now equally comprised of executive and non-executive directors and has a majority of female non-executives.
Based in Shanghai, Chiang will oversee Dentsu Aegis Network China, Dentsu Aegis Network Hong Kong, Dentsu Aegis Network Taiwan, and Dentsu Aegis Network Korea.
Based in Singapore, Powers will report to Charles Robinson, SVP, MD at Jack Morton Singapore, and?Damian Ferrar, global head of Genuine X.?
The appointment is effective January 2020 and MullenLowe Group will oversee the brands Bepanthen, Berocca, Canesten, Elevit, Iberogast, Redoxon, Rennie, and Supradyn.
Patterson will be responsible for GroupM's regional and country leadership and the investment, services, and IT functions.