Show Notes
In this episode of Edgy Ideas, Simon talks with Stewart Desson, founder of Lumina Learning, whose work has reshaped the field of psychometrics by bringing a deeply humanistic, culturally sensitive, and relational approach to understanding personality at work.
Stewart reflects on the evolution of psychometrics, from traditional trait-based systems to more nuanced, emergent models that honour human complexity rather than reduce it. Simon and Stewart explore how leadership, workplace culture, and collective performance are shaped by the ways we measure and make meaning from human behaviour. Drawing on large-scale data sets, Stewart shares insights into gendered leadership patterns, highlighting how women frequently bring more collaborative strengths to the fore and questions how organizations reward or neglect such capacities.
The conversation ranges widely: from the cultural biases embedded in psychological tools, to the rise of AI and its disruptive impact on assessment practices, to the philosophical question at the heart of both leadership and psychometrics: How do we live a good life and build a good society?
Stewart invites us to reconsider how organisations balance the drive for individual performance with the need for collective thriving, urging leaders to cultivate workplaces grounded in collaboration, kindness, and continuous self-development.

Key Reflections

Keywords
psychometrics, leadership, AI, workplace culture, individual performance, collective performance, cultural sensitivity, organisational psychology, human behaviour, collaboration

Brief Bio
Dr Stewart Desson, Board Member of the Association for Business Psychology and Founder & CEO of Lumina Learning, is a leading voice on how people’s behaviour drives organisational performance. Drawing on decades of experience and a PhD in Organisational Psychology, he revolutionised workplace psychometrics by empowering individuality through the Lumina Spark model. Over the past 15 years, he has built a global community dedicated to moving beyond traditional assessments toward a more nuanced, human-centred approach that helps organisations create adaptable, resilient, high-performing teams.