Client Success Manager (MMM)

Gain Theory; Greater London; On-site; GBP 70,000 - 110,000; Full time

Job summary

Gain Theory is a global marketing effectiveness and foresight consultancy. Our Client Success Manager role reports to the Client Success Director and focuses on delivering data-driven client outcomes in a fast-paced environment.

You will collaborate with cross-functional teams, translate analytics into client-ready insights, and drive projects to maximize client satisfaction and growth.

Qualifications

• 3+ years in analytically focused leadership in marketing analytics or consulting.
• Strong understanding of Marketing Mix Modeling, econometrics, or attribution methods.
• Proven ability to lead, manage, and develop high-performing Client Success teams.
• Demonstrated ability to manage client relationships and communicate complex analytics to non-technical audiences.
• Strong commercial mindset with experience identifying new opportunities.
• Excellent communication, presentation, and stakeholder management skills.
• Proven project management experience, with the ability to manage multiple projects simultaneously.
• Bachelor’s or Master’s degree in a quantitative field.

Responsibilities

• Drive optimal client project processes for work delivery and client satisfaction.
• Deliver high-quality client materials in line with strategic objectives.
• Contribute to collaborative team learning and knowledge sharing to strengthen capabilities.
• Deliver in specific areas of client engagement and management as defined by client leadership.
• Support with client growth initiatives and new business pitches.
• Cross-collaboration with analytics, data, and ops team members to ensure a well-functioning squad with high levels of satisfaction.
• Maintains a strong focus on the Marketing Effectiveness & analytics industry and those of our clients.

Skills

Data interpretation

Client relationships

Project management

Stakeholder management

Strategic thinking

Education

Bachelor’s or Master’s degree in Statistics, Economics, Mathematics

Tools

Excel

PowerPoint

R

Python

Job description

Gain Theory is part ofWPP , the trusted growth partner for the world's leading brands. Powered by exceptional talent and our agentic marketing platform WPP Open, WPP unites cutting-edge media intelligence and data solutions, creativity, production, enterprise solutions and expert strategic counsel.

The opportunity:

The Client Success Manager will report to the Client Success Director and work closely with the client leadership team to ensure optimal delivery and satisfaction. The ideal candidate should have a minimum of 3 years of experience in project management, client relationship management, and data analytics.

The Client Success Manager should be able to work in a fast-paced environment, manage multiple projects simultaneously, and prioritize tasks effectively. They should have excellent problem-solving skills, attention to detail, and a proactive approach to identifying and resolving issues.

The successful candidate should have a deep understanding of the Marketing Effectiveness and analytics industry and be up to date with the latest trends and developments. They should be able to interpret data and analytics insights and present them in a clear and concise manner to clients.

The Client Success Manager should be a team player and possess effective communication and interpersonal skills to collaborate effectively with cross-functional teams.

What you’ll be doing:

Accountabilities:

• Drive optimal client project processes for work delivery and client satisfaction.
• Deliver high-quality client materials in line with strategic objectives.
• Contribute to collaborative team learning and knowledge sharing to strengthen capabilities.
• Deliver in specific areas of client engagement and management as defined by client leadership.
• Support with client growth initiatives and new business pitches.
• Cross-collaboration with analytics, data, and ops team members to ensure a well-functioning squad with high levels of satisfaction.
• Maintains a strong focus on the Marketing Effectiveness & analytics industry and those of our clients.

KPIs & Success Factors:

• Client Satisfaction: Performance, Preference and Likelihood to Recommend
• Active Client Stakeholder #s
• Influence of Client Stakeholders
• Value Generated for Clients
• Client Advocacy (willingness to enter awards, provide references, awards)
• Average Annual Client Size
• Client Success Employee Satisfaction

Critical Capabilities:

• Data and analytical interpretation skills to bring GT insights to life for a client audience.
• Proficient in supporting project and client relationship management.
• Knowledgeable in SOW oversight and risk management practices.
• Committed to supporting quality assurance and best practice adherence.
• Effective communication and interpersonal skills to aid team collaboration.
• Strategic assistance in financial analysis for client budgeting and profitability insights.
• Lives and breathes Gain Theory values.

Key Relationships:

• Clients, Client Success Group
• Data, Analytics and Operations Practice Areas, New Business and Strategy

What we want from you:

• 3+ years of experience in an analytically focused leadership role, preferably within marketing analytics, consulting, or a related field.
• Strong understanding of Marketing Mix Modeling, econometrics, or attribution methods.
• Proven ability to lead, manage, and develop high-performing Client Success teams.
• Demonstrated ability to manage client relationships and communicate complex analytics to non-technical audiences.
• Strong strategic thinking and problem-solving skills.
• Strong commercial mindset with experience identifying new opportunities.
• Excellent communication, presentation, and stakeholder management skills.
• Proven project management experience, with the ability to manage multiple projects simultaneously.
• Skilled in tools such as Excel, PowerPoint, and at least one analytics environment (R, Python, or similar).
• Bachelor's or Master's degree in a quantitative field (e.g., Statistics, Economics, Mathematics).

Why work for us?

Gain Theory is committed to actively building a diverse, equitable and inclusive workplace where everyone feels welcomed, valued and heard, and is treated with dignity and respect. As leaders and creative partners across industries, it is our responsibility to cultivate an environment reflective of our greatest asset; our people. We believe that this commitment inspires growth and delivers equitable outcomes for everyone as well as the clients and communities we serve.

What we pride ourselves on:

• Growth and development
• Flexible by design
• Brilliant benefits
• Culture with Heart

Our exceptional and skilled team defines Gain Theory. That's why we seek individuals who strive for excellence and continually challenge us to improve.

What we do

Gain Theory is a global marketing effectiveness and foresight consultancy. Our vision is to accelerate growth for ambitious brands by giving clients the confidence to make better data-informed investment decisions. High-touch consultancy powered by unique partnerships and proprietary technology are used to power our award-winning solutions.

As a WPP consultancy, Gain Theory also has access to a range of data, expertise, and tools that create a truly differentiated offering.

Gain Theory is a WPP agency (NYSE: WPP).

Who we are

We are a people-centric organisation whose culture is underpinned by 4 important values: Be Curious , Be Positive , Make it Better and Act with Consideration. We channel these values through our behaviours, in the way we work, and in the interactions we have with each other and our clients.

WPP (Gain Theory) is an equal opportunity employer and considers applicants for all positions without discrimination or regard to characteristics. We are committed to fostering a culture of respect in which everyone feels they belong and has the same opportunities to progress in their careers.

Note: We rely on legitimate interest as a legal basis for processing personal information under the GDPR for purposes of recruitment and applications for employment