Client Support Administrator

Marsh McLennan•Phoenix, AZ

18h•Hybrid

About The Position

We are seeking a talented individual to join our GHSC Operations Client Support team at Mercer, a Marsh business. This role will be based in Phoenix and offers a hybrid work arrangement, requiring a minimum of three days per week in the office. As a Client Support Administrator, you will play a key role in keeping the team organized, efficient, and client-focused by managing a variety of administrative, project, and operational responsibilities. This position offers the opportunity to collaborate closely with senior leaders while producing polished, high-quality documents, coordinating client invoicing, and ensuring projects stay on track through strong attention to detail and sound judgment. Success in this role comes from balancing multiple priorities, handling confidential information with professionalism, and proactively supporting a seamless team workflow in a fast-paced, collaborative environment.

Requirements

HS Diploma or equivalent
5+ years of administrative support experience, preferably in a consulting environment or professional service industry
Advanced computer skills, including extensive experience with Microsoft Office (Outlook, Word, Excel, PowerPoint)
Strong judgment, discretion, confidentiality, and decision-making skills with the ability to interact with all levels within the organization
Capability to work well under pressure and with limited direction while handling multiple tasks and prioritizing effectively
Exceptional interpersonal, organizational, business communication, and time management skills.
Strong attention to detail
Demonstrated problem solving capabilities

Nice To Haves

Bachelor’s Degree
Strong project management skills
Excellent oral and written communication skills
Ability to adapt quickly to business needs and priorities
Previous billing/invoicing experience

Responsibilities

Complete monthly client invoicing
Establish, maintain, and manage client subject files, personal working files, and legal plan documents as applicable
Thrive and be motivated by an environment that embraces AI and technology-enabled tools
Provide peer review of documents before final production/distribution to ensure quality control of the final product
Ensure all documents produced adhere to Mercer's global identity/document standards
Contribute to accurate client/project budget management through accurate and prompt time entry
Handle sensitive information with professionalism and integrity while communicating openly and often among team members
Frequently interact and collaborate with senior-level leadership while performing tasks under limited supervision
Assist team with a variety of tasks as assigned