Senior Client Success Director (Hiring Immediately) in London

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 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.

• 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.

• ~ 1-30% growth opportunities. 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.

• 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 on risk mitigation process, highlighting any risks early and working on plans to mitigate.
• 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.
• Is an inspirational leader for Client Success Managers.

• 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).
• Demonstrated success in managing enterprise portfolios and influencing C-suite stakeholders across global brands.
• 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.

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; we believe that this commitment inspires growth and delivers equitable outcomes for everyone as well as the clients and communities we serve.

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.