Senior Account Manager

Acosta•Seattle, WA

About The Position

Mosaic is seeking a Senior Account Manager for its B2B Experiential Marketing team. The role serves as a strategic client leader and trusted partner, leading client relationships and the planning and execution of live experiences for business audiences. The Senior Account Manager oversees program delivery, budgets, and profitability, and guides cross-functional teams to deliver experiences that support customer engagement, pipeline, partnerships, and business objectives. The role combines client leadership, experiential marketing expertise, strategic thinking, commercial acumen, and hands-on execution. Programs may include conferences, trade shows, executive events, customer and partner programs, sponsorships, hospitality, and employee engagement events, from concept through execution and post-event reporting. The Senior Account Manager also supports account growth and business development, mentors junior team members, and partners closely with the Business Director on account and business objectives. Mosaic is part of Acosta Group and describes itself as an experiential marketing agency with more than 3,000 team members, hubs in Toronto and Dallas, and over 35 years of experience. The employer states that it is an equal opportunity employer and provides reasonable accommodations to applicants with disabilities.

Requirements

At least 7 years of account management experience within an experiential marketing, event marketing, sponsorship/activation, or integrated marketing agency.
Demonstrated experience leading B2B experiential programs, such as conferences, trade shows, executive events, customer and partner programs, sponsorships, hospitality, and other live business experiences.
Experience managing program budgets, scopes of work, forecasting, change orders, and profitability.
Proven ability to lead cross-functional teams, including strategy, creative, production, operations, and field staff.
Strong understanding of event planning, production, staffing, vendor management, logistics, and onsite execution.
Experience across B2B programs and complex client organizations.
Meaningful experience leading B2B live experiences and managing complex client relationships.

Nice To Haves

Experience working across both B2B and B2C programs; B2B experience is mandatory.
Agency-side experiential marketing experience.
Experience managing national B2B event portfolios, conferences, trade shows, sponsorships, executive programs, hospitality, or large-scale business events.
Experience managing event partners, production vendors, venues, staffing agencies, and onsite teams.
Experience supporting Fortune 500 clients and complex stakeholder organizations.
Experience managing integrated B2B campaigns connecting experiential, digital, content, communications, sales, and demand-generation channels.

Responsibilities

Serve as the primary day-to-day client contact and trusted advisor across assigned accounts.
Build client relationships by understanding business objectives, marketing priorities, and organizational dynamics.
Lead strategic conversations connecting experiential marketing programs to broader business goals.
Facilitate client meetings, presentations, workshops, and program reviews.
Anticipate client needs, provide proactive counsel, and identify opportunities to strengthen partnerships and grow agency business.
Lead B2B experiential marketing programs from concept through execution and post-event reporting.
Partner with Project Management to develop scopes of work, workbacks, staffing plans, and operational roadmaps.
Collaborate with strategy, creative, production, operations, finance, and analytics teams, representing the client internally.
Anticipate risks, solve challenges proactively, and maintain accountability for program performance, quality, and client satisfaction.
Translate business objectives into experiential marketing strategies and recommendations.
Develop engagement programs for customers, prospects, partners, employees, and other business audiences that drive measurable results.
Develop innovative ideas informed by audience needs, customer journeys, industry trends, and marketplace insights.
Own program budgets, forecasts, reconciliations, and profitability management.
Develop estimates, scopes of work, change orders, and client proposals.
Monitor financial performance and identify opportunities to improve efficiency and profitability.
Support account growth through client stewardship and commercial management.
Lead and motivate cross-functional teams to deliver client outcomes.
Mentor and develop junior team members.
Foster collaboration, accountability, and continuous improvement.
Partner with the Business Director to support account and business objectives.
Identify opportunities to expand client relationships and agency services.
Contribute to account growth strategies, new business initiatives, and proposal development.