Psychological insight for key leadership decisions.
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In today’s environment, leadership success is no longer defined by experience alone.
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The ability to adapt, learn and make effective decisions under pressure has become a critical differentiator. Yet these capabilities are often difficult to assess using traditional methods.
For organisations operating at pace, the challenge is not simply identifying proven leaders, but selecting those who will perform in increasingly complex and evolving contexts.
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THEPA is an independent business psychology practice specialising in the assessment of senior leaders. We provide rigorous, evidence-based insight into leadership capability, potential and performance — supporting boards, investors and search partners in making critical talent decisions.
Our work goes beyond track record, focusing on how individuals think, operate and respond under pressure. This enables more accurate prediction of future performance, particularly in high-stakes environments where the cost of misjudgement is significant.
Sarah Skinner, EVP EMEA & Global Business Strategy Advisor, Grace Blue
"As an executive search firm, we understand the importance of rigour and insight in how we assess candidates. When it comes to the deep dive leadership assessment using the blend of psychometrics and in person analysis, Marcelle is the only partner we use and recommend to our clients.
Her clarity, framework, approach and analysis are expertly blended to give incredibly perceptive and accurate insights into our candidates. She takes the time to understand the brief, the context, the requirements of the role. Every candidate who has worked with Marcelle speaks consistently of the outstanding experience, and every client can immediately see the value and perspective Marcelle brings in order for them to make an informed decision.
Marcelle always brings a strategic, informative and objective view point. And just as importantly is a joy to work with."
Julian Read, CEO, Doro Consumer Electronics
" Marcelle is a great support to me in my role as CEO. Our coaching sessions focus upon the challenges ahead and how to leverage my strengths whilst being mindful of the things that come less naturally to me. I always leave our discussions mindful of my own behaviours and observe those of others which enables me to be more effective in my role. Marcelle has also supported other managers in my business within a 360-degree feedback process followed up with one-to-one coaching. I would, without doubt, recommend Marcelle to any leader interested in personal development as a means to being more effective in their interactions with key stakeholders and for personal growth"
Honor Pollok, Founder & CEO Kynigos Partners
“ The Board and Chair of a well-established media company wanted a deep assessment of two exceptional final CEO candidates to supplement the search process, aid their decision-making process and support the on-boarding of the successful candidate. The quality and accuracy of Marcelle’s assessments were outstanding, providing the client with the additional data points needed to differentiate between the two candidates and aid the creation of an onboarding programme.
Professional, focused on meeting my client’s needs and highly responsive it was a pleasure to work with Marcelle. I would highly recommend her and will definitely work with her again. "
Our Values
Excellence
Our work is defined by rigour. Every assessment is grounded in expert measurement, psychological science and global benchmarking, ensuring consistently high-quality, evidence-based outcomes.
Integrity
We operate with independence, objectivity and discretion. As Chartered Psychologists, our work is guided by a strict professional code, ensuring honesty and ethical practice at every stage.
Respect
We place equal importance on how assessment is experienced as on its outcome. Participants are treated with professionalism and care, ensuring the process is both rigorous and valuable for those involved.