Senior Client Success Director

twentysix; Greater London; On-site; GBP 90,000 - 130,000; Full time

Benefits offered by this job

Hybrid by design

Brilliant benefits

Flexible by design

Job summary

Gain Theory is hiring a Senior Client Success Director in Greater London. You will lead strategic client relationships, drive data-driven insights, and partner with C-suite stakeholders to secure value and growth. The role requires deep marketing analytics expertise and leadership across enterprise portfolios.

You’ll be a trusted advisor, guiding projects, shaping client strategy, and building a high-performing Client Success team within a hybrid-work environment.

Qualifications

• 8+ years in client success, consulting, or marketing analytics with leadership exposure.
• Advanced expertise in Marketing Mix Modeling and econometrics.
• Proven ability to lead diverse Client Success teams and influence C-suite stakeholders.
• Strong strategic, analytical, and commercial mindset with enterprise oversight.

Responsibilities

• Lead senior client relationships, driving measurable outcomes and growth.
• Oversee projects across portfolios with focus on time, scope, and quality.
• Manage profitability through value realization and efficient processes.
• Mentor and develop Client Success teams and cross-functional partners.
• Communicate complex analytics simply to non-technical leaders.

Skills

Client relationship management

Data analytics

Leadership

Strategic thinking

Communication

Stakeholder management

Project management

Excel

PowerPoint

R

Python

Education

Bachelor's or Master's degree in a quantitative field

Tools

Excel

PowerPoint

R

Python

Job description

Who We Are

VML, part of WPP, is a leading creative company that combines brand experience, customer experience, and commerce, creating connected brands to drive growth. VML is celebrated for its innovative and human first, award-winning work for blue chip client partners including AstraZeneca, Colgate-Palmolive, Dell, Ford, Microsoft, Nestlé, The Coca-Cola Company, and Wendy's. The agency is recognized by the Forrester Wave™ Reports, as a Leader among Marketing Creative and Content Service Providers, Commerce Services, Global Digital Experience Services, Global Marketing Services and, most recently, Marketing Measurement & Optimization. In addition, VML’s specialist health network, VML Health, is one of the world’s largest and most awarded health agencies. VML’s global network is powered by 26,000 talented people across 55+ markets, with principal offices in Kansas City, New York, Detroit, London, São Paulo, Shanghai, Singapore, and Sydney.

About WPP

WPP is the trusted growth partner for the world’s leading brands. We unite cutting-edge media intelligence and data solutions, world-class creativity, next-generation production, transformative enterprise solutions and expert strategic counsel in a single company – powered by exceptional talent and our agentic marketing platform, WPP Open, to help our clients navigate change, capture opportunity and deliver transformational growth. For more information, visit WPP.com.

What you’ll do:

We are seeking a Senior Client Success Director with deep expertise in Marketing effectiveness and econometrics to lead our most strategic client relationships and shape the future of our client success function. In this senior leadership role, you will serve as a trusted advisor to C-suite executives, ensuring our advanced analytics solutions deliver measurable business outcomes while driving account growth and retention.

The Client Success Senior Director will be responsible for client leadership across a selection of Gain Theory’s portfolio. The ideal candidate should have a minimum of 8 years of experience in client relationship management and data analytics.

We expect this person to be the primary point of contact for senior client stakeholders and to act as a trusted advisor, deeply understanding client business objectives and leveraging Gain Theory’s expertise to deliver exceptional value and drive measurable results.

We require someone who has a deep understanding of data and analytics, is able to interpret complex datasets and extract actionable insights that drive client success.

This person should serve as an inspirational leader within the Client Success team, fostering a collaborative and results-oriented environment.

Key Responsibilities

Project Delivery:

• Ensures projects within remit are managed to time and scope. Highlights any risks to client lead.
• Puts in place robust quality assurance techniques and follows them to ensure work going to clients is right first time.
• Uses data and analytics interpretation skills to bring insights to life for a mid-senior audience (i.e. most senior day-to-day client stakeholder)
• Is a strong data storyteller who can explain complex insights at a simple, impactful level to a variety of audiences.
• Ensures clients have full knowledge and training of Gain Theory Interactive, highlighting any bugs or enhancements to the GTI team.
• Ensures projects are following Operational Excellence process and that there is full adherence from Client Success team.

Financial:

• Looks for opportunities to drive profitable growth for clients and take on incremental (e.g. 1-30% growth) opportunities. Bring in client lead and senior team for larger opportunities.
• Identifies values driven for clients and looks to assist clients in recognising that value.
• Understands how decisions made on projects will impact profitability and looks to run more efficient processes or tighter management of scope, designed in consultancy with client lead.
• Understands how actions they take will impact overall Gain Theory profitability and looks to make the right decisions towards this at all times
• Is involved in new business pitches as part of a wider team. May be expected to lead opportunities that do not need a large team.

Client Management:

• Manages against SOW to ensure limited scope creep and slippages.
• Implements plans to drive higher client satisfaction across every metric, highlighting any issues to client leadership.
• Helps to increase the number of stakeholders and advocacy at the right level (e.g. most senior day to day stakeholder). Works with client leadership to embed plan.
• Works with client leadership on risk mitigation process, highlighting any risks early and working on plans to mitigate.

Thought Leadership:

• Has sufficient knowledge of most of Gain Theory solutions, systems and ways of working to have a healthy conversation with a client in any aspect of Gain Theory's offering. Is actively looking to learn in this space.
• Maintains a solid understanding of their clients' industries, keeping up to date with key trends and seeking opportunities for growth.
• Maintains a good understanding of the marketing effectiveness industry, assessing for threats, challenges and opportunities that said industry presents to client relationships.

Values & Team:

• Is an inspirational leader for Client Success Managers.
• Implements initiatives to improve Client Success team satisfaction within squad. Understands what drives employee satisfaction and looks to make things better for all.
• Facilitates collaborative learning and knowledge sharing to boost team capabilities.

KPIs & Success Factors:

• Net Sales Growth
• of Client Stakeholders
• Client Influence
• Client Advocacy
• Client Satisfaction
• Client Success Practice Area ESAT
• OPEX Implementation
• Value generated for Clients
• Awards entered

What you’d need to succeed:

• 8+ years of experience in client success, consulting, or marketing analytics roles, with significant client-facing responsibility.
• Demonstrated expertise in Marketing Mix Modeling and econometrics (model interpretation, ROI analysis, elasticity, attribution methods).
• Proven ability to lead, manage, and develop high-performing Client Success teams.
• Demonstrated success in managing enterprise portfolios and influencing C-suite stakeholders across global brands.
• 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 Theoryiscommitted 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
• Meaningful work
• 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 isaWPPagency(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.

We believe the best work happens when we're together, fostering creativity, collaboration, and connection. That's why we’ve adopted a hybrid approach, with teams in the office an average of four days a week. If you require accommodations or flexibility, please discuss this with the hiring team during the interview process.

WPP (VML) 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.

VML is a WPP agency (NYSE: WPP). For more information,please visit www.vml.com, andfollowalong on Instagram,LinkedIn, andX.