Incumbent Starcom, which is also in the running for the account, manages Subaru's media buying and planning.
The GroupM agency bested PHD and Hearts & Science.
The pitch was backed by the agency's data and analytics division, GroupM's data technology capability, and WPP Open.
The GroupM agency has hosted a fireside chat with Dr Charlotte Keating, resident psychologist at ABC Radio.
In his last three years as CIO, Thomas had been managing 240 people and almost $1bn in billings.
The team will lead the charge in providing client consultation and business solutions.
The account will continue to be serviced out of EssenceMediacom Sydney and led by client partner Daniel Morgan.
He has over 14 years of experience in the media industry and worked across a variety of categories and international markets.
The account was won in a closed pitch process with the incumbent, PHD.
Iwamoto and Anand share their perspectives, thoughts and opinions.
Rohan Nayee: "I can't wait to play my part in a truly unique agency/client partnership"
The 5th annual event was held in Melbourne
Across APAC, the deal is reported to be worth approximately USD$150 million
Stevie Douglas-Neal: "I am delighted to have client leadership of the calibre of Amy and Hannah joining the business"