Full-Time
Client Success Senior Director
Posted on 7/14/2025
Gain Theory
201-500 employees
Global marketing analytics and optimization consultancy
No salary listed
London, UK
In Person
 Consulting (2) |
|---|
| , |
- A minimum of 8 years of experience in client relationship management and data analytics.
- The primary point of contact for senior client stakeholders and act as a trusted advisor, deeply understanding client business objectives and leveraging Gain Theory’s expertise to deliver value.
- Deep understanding of data and analytics, able to interpret complex datasets and extract actionable insights that drive client success.
- Serve as an inspirational leader within the Client Success team, fostering a collaborative and results-oriented environment.
- 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.
- 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.
- 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 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.
- 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.
- 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.
Gain Theory is a global marketing effectiveness and foresight consultancy that helps brands grow by making smarter, data-informed marketing investments. It uses data, advanced analytics, and technology to combine past performance, current insights, and future scenarios. Five pillars guide its work: a Marketing Effectiveness Index to identify barriers and opportunities, data excellence, sources of growth, levers of growth (including MMM, attribution, unified measurement, and test-and-learn), and foresight to plan for possible futures. The firm differentiates itself through its global reach in 58 markets, specialized industry knowledge, and recognition by Forrester, with the goal of turning data into quick, actionable investment decisions that accelerate growth.
Company Size
201-500
Company Stage
N/A
Total Funding
N/A
Headquarters
New York City, New York
Founded
2015
Simplify's Take
What believers are saying
- 47% US marketers plan MMM investments next year per EMARKETER.
- ANA partnership grants exclusive CMO access to data initiatives.
- WPP integrations with Choreograph, BAV, Kantar build measurement moat.
What critics are saying
- Open-source MMM tools commoditize capabilities, erode pricing in 12 months.
- WPP divisions create channel conflicts, trigger client hesitation now.
- AI-native rivals like Google capture share with lower costs in 18 months.
What makes Gain Theory unique
- Gain Theory fuses 50 years of expertise with AI for marketing effectiveness.
- Provides MMM beyond media, measuring creative, pricing, macro factors.
- Embeds forecasting, scenario planning for proactive 2026 optimization.
Help us improve and share your feedback! Did you find this helpful?
Benefits
Health Insurance
Life Insurance
Hybrid Work Options
Paid Vacation
Mental Health Support
Generous Pension Plan
Company News
Gain Theory unveils five essential strategies to navigate the crowded MMM landscape in 2026. November 11, 2025. Gain Theory today released a new guide, Making MMM Fit for 2026: An Essential Guide for Marketers, providing guidance on navigating the rapidly evolving marketing mix modeling (MMM) ecosystem and maximizing marketing effectiveness in an increasingly volatile landscape. The comprehensive guide addresses the surge in MMM adoption, with nearly half (47%) of US marketers planning to invest in MMM over the next year, according to EMARKETER data cited in the guide. It comes as marketers face mounting pressure to demonstrate the value and impact of marketing against business objectives and defend budgets amid economic volatility. The report also warns that a surge of new entrants in the MMM ecosystem, from SaaS platforms and open-source tools to technologies that complement existing solutions, is making it challenging for marketers to discern meaningful differences among providers. "In an increasingly crowded MMM ecosystem, marketers need clarity on how to extract maximum value from their measurement investments. Speed and sophistication should not be seen as a trade-off - the best MMMs deliver both through a combination of technology and expertise. If your MMM can only tell you where you've been, you're flying blind into 2026. This guide provides the roadmap for making MMM a true business growth engine" Sam Fellows Managing Partner, Gain Theory The guide provides five recommendations for marketers to maximize value potential from their MMM programs and build confidence in marketing impact in 2026. These include: * Balance speed with adaptability and actionability: Technology is pushing boundaries in cost and speed, but an overfocus on reporting frequency can come at the expense of generating actionable insights that drive real business value. * Prove long-term value, not just short-term ROI: IPA Databank Research indicates that while marketing ROI has increased by 4% since the COVID pandemic, net profit has decreased by 11%. Overly focusing on ROI reinforces the view that marketing is a cost that can be cut, risking untapped incremental sales. * Go beyond media-only measurement: MMM is most often used to understand how media has impacted sales. But it can also measure non-media drivers such as creative, sponsorships, pricing and macroeconomic factors, which are crucial in volatile market conditions. * Don't strive for perfect data: The quest for perfect data is a luxury few businesses can afford. Focus on using available data for directional insights whilst building a pragmatic roadmap for continuous data improvement. * Get insights into what might happen, as well as what has happened: If your MMM can only tell you where you've been, you're flying blind in 2026. Embedding forecasting and scenario planning enables proactive optimization rather than reactive analysis. The guide also includes a practical checklist to help marketers evaluate MMM capabilities and five critical questions to ask current or potential MMM providers, so they can confidently navigate provider selection and maximize measurement investments. Download Making MMM Fit for 2026: An Essential Guide for Marketers. About Gain Theory: Gain Theory is a leading global marketing effectiveness and foresight consultancy with over 50 years of innovation. By fusing deep expertise with advanced AI, Gain Theory Ltd empower marketers to make smarter and faster data-informed investments that deliver unmatched value. Its innovative solutions provide actionable insights that enable continuous experimentation and improvement, transforming marketing into a sustainable engine for growth. Making MMM Fit for 2026: An Essential Guide for Marketers blends current market trends, proprietary research, and real-world case studies to provide actionable guidance for marketers preparing for 2026. Making MMM Fit for 2026: An Essential Guide for Marketers was compiled by experts from Gain Theory's global team in November 2025, drawing on over 50 years of innovation in marketing effectiveness and insights from working with leading global brands across multiple sectors.
NEW YORK--(BUSINESS WIRE)--Gain Theory, a WPP-owned global marketing effectiveness and foresight consultancy, announced a strategic Data and Measurement partnership with The Association of National Advertisers (ANA) today. This partnership showcases Gain Theory’s industry-leading marketing measurement and optimization capabilities, cementing its position as a trusted advisor to brands navigating the complexities of the modern marketing landscape. As the leading advertising industry body, the ANA is committed to driving a CMO-endorsed growth agenda. Among the most important initiatives of the ANA CMO Growth Council are those centred on data, technology, and measurement — the capabilities that will ensure marketers succeed in the future. Through this partnership with the ANA, Gain Theory will offer exclusive perspectives into AI-driven marketing measurement, next-generation insights, and the future of foresight. These insights will enable CMOs to navigate market shifts and optimize growth strategies, leveraging the power of AI
New York, United States: Gain Theory., a global marketing effectiveness and foresight consultancy that accelerates growth for ambitious brands, has been named a Leader in The Forrester Wave™: Marketing Measurement and Optimization, Q3 2023.
WPP-owned global marketing effectiveness and foresight consultancy Gain Theory has unveiled a new brand identity and website to better reflect its growth acceleration proposition.