Pr 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
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.
Its objective: to enable individuals and groups to unleash their full potential to achieve sustainable, authentic performance aligned with their values.
Isabelle Bricault
Partner, Administrative and Financial Manager
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.
Evgeny Osin
Associate, Doctor of Psychology, Researcher and lecturer
Dr. Evgeny Osin is an internationally recognised specialist in positive psychology and quantitative methods. A prolific researcher, he has contributed to over 150 scientific publications, exploring key themes such as motivation, meaning, psychological resources, and the influence of social contexts on well-being. At Positran, Evgeny uses his expertise to develop innovative psychometric tools and diagnostics. Co-author, with Professor Ilona Boniwell, of the Positive Organisational Profile model, he contributes to integrating rigorous scientific approaches into concrete and accessible solutions, allowing organisations to measure and strengthen their resources and fulfillment. Thanks to his scientific rigor and his ability to transform complex concepts into practical tools, Evgeny plays a key role in Positran's innovations. His work ensures that the tools and diagnostics proposed are reliable, relevant, and impactful , serving well-being and sustainable performance.
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
Le Dr Evgeny Osin est un spécialiste internationalement reconnu en psychologie positive et en méthodes quantitatives. Chercheur prolifique, il a contribué à plus de 150 publications scientifiques, explorant des thématiques clés telles que la motivation, le sens, les ressources psychologiques et l'influence des contextes sociaux sur le bien-être.
Au sein de Positran, Evgeny met son expertise au service du développement d'outils psychométriques et de diagnostics innovants.
Mario Membrillo Gil
Mario est instituteur et professionnel de la psychologie positive en Espagne, et il intègre l’intelligence émotionnelle aussi bien dans les environnements éducatifs que professionnels. À travers SABER-SΣ, il développe des programmes fondés sur des preuves qui renforcent la connaissance de soi, la communication, la résilience et le bien-être. Son travail aide les élèves, les équipes et les leaders à cultiver des cultures positives où chacun peut apprendre, se connecter et donner le meilleur de lui-même.
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 est psychologue et consultante-formatrice en psychologie positive au sein de Positran depuis de nombreuses années. Collaborant avec Ilona Boniwell et des chercheurs, elle intègre les dernières avancées scientifiques dans ses interventions et formations.
Elle conçoit également des outils ludiques pour faciliter l’appropriation des 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.
