The science of human performance, built for the real world.
Our Story
Positive was founded on a simple idea: human behaviour is the key to how people perform, adapt and thrive.
We bring together psychological expertise with a sharp focus on how organisations operate in the real world shaped by decades of work across clinical, organisational and leadership contexts.
At the heart of everything we do is a single principle: the greatest source of untapped performance in any organisation is its people. Specifically, their capacity for collaboration and to lead with confidence under pressure.
Psychologists. Neuroscientists. Behavioural scientists.
Positive brings together researchers and clinical experts alongside specialists with commercial experience across professional services and global enterprise.
Dr Brian Marien
Brian is a medical doctor with expertise in cognitive and behavioural psychology. He equips leaders with evidence-based strategies for resilience and high performance and has spent over a decade embedding psychologically informed leadership into global organisations.
Will Marien
Will is passionate about workplace performance and organisational behaviour change. He’s spent the last 10 years working across multiple sectors, transforming behaviours and culture in SMEs, corporates, schools and universities.
Dr Sinéad Devine-French
Sinéad leads the design of science-led solutions, translating neuroscience and behavioural psychology into practical strategies for leadership and performance. She partners with senior leaders to build the human capabilities needed to navigate complexity and lead effectively in an AI-enabled world.
Dr Catherine Marshall
Catherine is a medical doctor with a background in forensic psychiatry, bringing psychological models to life through tailored facilitation. A decade in the UK healthcare system gave her deep insight into decision-making, judgement and behavioural risk under pressure.
Dr Eloise Crush
Eloise spent ten years in corporate banking and consultancy before returning to psychology, completing a PhD on psychological resilience. She specialises in the protective factors that sustain wellbeing and performance under pressure.
Juliet Mooney
Juliet has over a decade of experience in client operations, starting in finance before working across private and public sectors. She’s driven by the belief that psychology helps teams reach their full potential.
Dr Jazz Croft
Jazz leads Positive’s research communications and content strategy, translating behavioural science into clear, compelling narratives. She holds a PhD in psychiatric epidemiology and previously worked with digital health start-ups on research and communications.
Jo Rosen
Jo leads finance at Positive, bringing international experience across the UK, Netherlands and Australia, including leading finance for an APAC tech firm and working as a financial analyst across global corporations in EMEA.
Emma Jones
With over five years’ experience in the public sector and a Master’s degree in Health, Emma brings a strong foundation in organisational development and a focus on creating a seamless experience for clients and colleagues alike.
Joselyn Hunt
Joselyn shapes how Positive expresses its identity and evidence-based work visually. She holds a BA in Graphic and Communication Design, with a background in pre-sales and a passion for turning complex ideas into clear, accessible content.
Oscar Treleaven
Oscar holds a Master’s in Psychology of Education and has applied learning theory across all levels of seniority in the private sector. At Positive, he helps simplify complex concepts so clients can find effective, practical solutions.
Dr Sophia Seltzer-Eade
Sophia is a clinical psychologist trained across a number of evidence-based approaches, with a particular interest in Cognitive Behavioural Therapy. She’s worked across clinical and business settings with client groups spanning the lifespan.
Dr Alice Gee
Alice is a Clinical Psychologist. She worked in NHS psychological services for ten years before setting up in private practice. She has a wealth of experience in the application of psychological approaches for organisations to improve wellbeing, resilience and performance.
Dr Claire Garner
Dr Claire Garner is a Chartered Psychologist and PCC-accredited executive coach, with extensive international experience across public sector, consulting and in-house Talent and OD roles. She specialises in applying psychological insight to senior leaders and executive teams.
Clare Benka
Clare has a Masters in Occupational & Organisational Psychology, and considerable experience as a consultant and coach. She runs a London clinic in physical therapies, and has a wealth of delivery experience with a wide range of organisations and corporates.
Trish Pashazadeh-Allen
Trish is a trained Cognitive Neuroscientist with 15 years of finance and business leadership experience. She blends scientific expertise with first-hand knowledge of corporate culture, to empower businesses with strategies for positive mental health in the workplace.
Francesca Bell
Francesca is an executive coach and management consultant with deep expertise in leadership development, organisational transformation and behavioural change.
Prof. Chris Wagstaff
Chris is a Professor of Applied Psychology and a Chartered Practitioner Psychologist with over 20 years’ experience in elite sport. He has worked as a psychologist at four Olympic Games and previously served as Head of Psychology at the UK Sports Institute.
Dr Katere Adeseko
Dr Kati is an Applied Psychologist and leadership and organisational psychology consultant. With a Doctorate in Psychology and an academic role as a Doctorate Supervisor, Kati brings a scientifically grounded approach to the psychology of leadership, self-awareness, and team performance.
Georgia Bolton
Georgia has a Psychology degree and almost 20 years’ experience helping individuals and teams strengthen their leadership. With a special interest in the APAC region, she is passionate about building cross cultural communication and positive psychological health for leaders.
Simon Wilton
Simon is a highly experienced facilitator, coach, and leadership trainer with a career spanning over 25 years. His expertise lies in helping individuals and teams communicate with clarity, presence, and impact.
Emma Wellingham
Emma is a professional change leader with over 15 years of people, leadership and change consulting experience in partnership with international organisations across diverse industries.
Colm Roche
Colm is responsible for the Positive brand and oversees the company’s creative output, including our website, app, online platforms and illustration. He has over 15 years’ experience, working with major international brands such as Nike, Tate, Unilever and NetJets.
Scientific Advisory Board
Professor Tom Sensky
Professor Trudie Chalder
Professor Paul Brown
Geoff Bird
Business Advisory Board
Alastair Aird
