Executive Assistant

Omnicom Media (OM), the media services division of Omnicom Group Inc. (NYSE: OMC) – delivers transformational experiences for consumers, clients, and talent. Powered by the Omni marketing orchestration system, OM connects best-in-class capabilities that enable our full-service media agencies OMD, PHD, and Hearts & Science to deliver more relevant and actionable consumer experiences, more productive and proactive client experiences, and more collaborative and rewarding talent experiences for the more than 24,000 people serving the world’s leading brands in OM agencies around the globe.

EA to Global Chief Client Success Officer (CCSO) About The Role This role requires building a close working relationship with the Global Chief Client Success Officer , handling a range of executive and administrative support tasks to ensure the CCSO is maximising their time efficiently and can operate at pace across a global, client-centric agenda. Whilst acting primarily as Executive Assistant to the Chief Client Success Officer (CCSO), you’ll also be providing broader support across the Client Success function. The role will be integral to the day‑to‑day operations of the team, driving coordination and cohesion across multiple stakeholders and supporting a diverse portfolio of global clients.

You will act as a trusted gatekeeper and connector across a broad set of senior internal stakeholders (global and regional Client Success leads, Strategy leadership, agency brand presidents, and key functional partners), as well as senior external/client contacts. The right candidate will be highly proactive, calm under pressure, exceptionally organised, and able to anticipate needs in a fast-moving environment where priorities can shift quickly.

Your role will be diverse and things you will handle include but are not limited to:

• Booking all travel and accommodation. The CCSO is a regular traveller, so you’ll need to be comfortable booking complex, multi-leg itineraries while remaining budget conscious and policy compliant.
• Full diary management, including liaising with internal and external contacts across multiple time-zones to ensure meetings are scheduled effectively and conflicts are proactively managed.
• End-to-end coordination for leadership cadence meetings (e.g., weekly leadership calls, workstream check-ins, and broader leadership forums), ensuring the right attendees are present, materials are requested in advance, and actions are tracked where needed.
• Supporting key client success moments (e.g., senior client meetings, leadership summits, and external industry events), including logistics and prep coordination..
• Processing of expenses in a timely manner, including reconciliation across currencies and understanding of overseas fees and claims requirements.
• Booking internal meeting rooms, arranging catering and IT support where necessary, and ensuring meetings run smoothly (in-person and virtual).
• Meeting and greeting visitors, ensuring their experience is welcoming and seamless, with high attention to detail and professionalism.
• Supporting the planning and booking of client/external entertainment and events (from client dinners through to large-scale leadership events).
• From time to time, aiding in new hiring, including scheduling interviews through to coordinating onboarding logistics.
• Occasional management of office-related tasks such as IT kit or stationery ordering, where required to support the CCSO and leadership office.
• There will also be, on occasion, the opportunity to work on projects. These could include research support, coordination of leadership communications, or project management for internal events and engagement moments, working with a wider team in a coordination role.

What You Will Bring To The Role We are looking for a real team player who is positive, calm, and has a passion for being that “I’ve got this” person — you’re a champion at finding a solution, even when the parameters are changing.

• You juggle complex diaries in your sleep and have a natural ability to deliver at short lead times.
• You are confident managing multiple time zones and senior stakeholder expectations — calendars don’t faze you, and you know your EST from your GMT.
• You can pull together a high-quality internal or client-facing engagement at pace — from coordinating a last-minute leadership meeting to arranging a dinner with minimal notice.
• You have excellent judg…