A passionate team at the heart of an ecosystem of world-renowned specialists.
Professor Ilona Boniwell
Founder and CEO
Prof. Ilona Boniwell, PhD, is a leading figure in positive organisational psychology and executive coaching, with over 25 years of experience in research, teaching, and consultancy. Ilona is a CEO of Positran, Associate Professor of Management and Human Resources at HEC Paris (Education Track), Visiting Professor at Oxford Brookes and Musashino University, Adjunct Professor at Ecole Centrale Supelec, and Faculty of VIA Institute of Character. She wrote or edited 12 books and delivered over 400 presentations, including a TEDx talk. Passionate about applications of psychological science, Ilona taught and trained thousands of business leaders, HR professionals, trainers and consultants how to optimise well-being and engagement, enhance resilience and use insights from psychological assessment. Her approach blends experiential learning, gamification, and thoughtfully crafted pedagogical design.
Marianne Didier
Operations Director, Partner & Professional Coach
A certified professional coach, Marianne orchestrates transformation by placing people at the heart of the strategy. Marianne supports leading organizations such as CDC Habitat, the CNRS, and Enedis in the success of their most ambitious projects: mergers, management reorganizations or the deployment of new managerial cultures. Her unique approach draws on dual expertise in change management and positive psychology applied to the workplace. She designs and leads tailor-made programs, combining educational engineering, coaching, and gamification to catalyze engagement. Recognized for her deep empathy and relational intelligence, she establishes a secure framework of trust , conducive to dialogue and co-construction.
Her objectives: to enable individuals and groups to unleash their full potential to achieve sustainable, authentic performance aligned with their values.
Isabelle Bricault
Administrative and Financial Manager & Partner
Isabelle Bricault is a key player at Positran. Rigorous and organized, she ensures the proper administrative and financial management of the company , while providing a clear and balanced vision in a constantly changing environment. Her interpersonal skills, kindness, and pragmatic approach allow her to design concrete and adapted solutions, always serving the development of Positran. Driven by a deep team spirit, Isabelle works hand in hand with Ilona and the entire Positran team. Her attentive listening skills and ability to anticipate the needs of others make her a pillar of trust, ensuring harmonious management aligned with the company's values and ambitions. Thanks to her strategic vision and constant commitment, Isabelle plays a vital role in the well-being and collective success of Positran. Her skills and humanity intertwine to create an environment conducive to growth, collaboration, and excellence.
Melusine Plotin
Digital Project Manager
With a hybrid background in biotechnology and marketing , Mélusine has developed an analytical and creative vision for both physical and digital projects. This dual skill allows her to deeply understand technical issues while knowing how to translate them into appropriate communication and development strategies .
In her role as project manager, she carefully manages each step: from defining needs to operational implementation, including team coordination and performance monitoring. Her approach is based on organisation, creativity and commitment , always with the aim of providing innovative and effective solutions.
Enthusiastic and curious, she enjoys working in a team, creating synergies, and sharing her positive energy. She deeply believes that a successful project is born as much from rigor as from passion and the pleasure of collaborating.
Alicia Pigeard
Executive Assistant
A true pillar of Positran's daily operations, Alicia combines organisational rigor and interpersonal skills . Dynamic and action-oriented, she enjoys taking on challenges with enthusiasm and making herself available to support both the team and clients.
Her career in events has allowed her to develop great interpersonal skills and a real pleasure in creating connections. Today, she puts these qualities to the service of positive psychology , efficiently managing the entire back office : quotes, invoices, call management, logistical organisation of training and preparation of tools.
Always smiling and committed, Alicia stands out for her love of teamwork and her ability to unite people around common projects. She regularly represents Positran at trade fairs and professional events , where her infectious enthusiasm helps to promote our tools and share, in a concrete and accessible way, what positive psychology can bring to everyday life.
Our experts
Justine Chabanne
As a professional coach, Marianne Didier places people at the heart of transformation. A specialist in positive psychology in the workplace, she combines instructional design and coaching to create customized programs aimed at developing leadership, engagement, and well-being. Known for her empathy and active listening skills, she fosters a climate of trust essential for individual and collective growth, a true driver of sustainable and aligned performance.
Evgeny Osin
Dr Evgeny Osin is an internationally recognized specialist in positive psychology and quantitative methods. A prolific researcher, he has contributed to more than 150 scientific publications, exploring key themes such as motivation, meaning, psychological resources and the influence of social contexts on well-being.
Within Positran, Evgeny uses his expertise to develop innovative psychometric tools and diagnostics.
Mario Membrillo Gil
Mario is a teacher and positive psychology professional in Spain, and he integrates emotional intelligence into both educational and professional environments. Through SABER-SΣ, he develops evidence-based programs that strengthen self-awareness, communication, resilience and well-being. Her work helps students, teams and leaders cultivate positive cultures where everyone can learn, connect and perform at their best.
Gaëlle Rohou
Gaëlle has recognised expertise in HR development, change management, and positive psychology applied to organisations. An experienced consultant and coach, she supports executives, managers, and teams in their transitions, focusing on leadership development, mobilising collective intelligence, and creating sustainable engagement dynamics.
Justine Chabanne
Justine has been a psychologist and consultant-trainer in positive psychology at Positran for many years. Collaborating with Ilona Boniwell and researchers, she integrates the latest scientific advances into her interventions and training.
She also designs fun tools to facilitate the appropriation of concepts.
Larissa Kalisch
Larissa is a former high-level figure skater and coach since the age of 17, she has acquired solid experience in coaching and motivation. After a degree in psychology in Fribourg and a research internship in psycho-oncology at the Marie Curie Institute, she moved towards an international master's degree in positive psychology, more in line with her interest in well-being and human development.
Lucy Airs
Lucy is a certified trainer and coach in positive psychology and positive education, and holds a Master's degree in Applied Positive Psychology. With over ten years of international coaching and training experience, she specialises in positive, intercultural, and nonverbal communication. She now designs customised interventions focused on resilience, strengths, creativity, change, and workplace well-being.
