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Team

Meet our experts

The Positive team thrives on differences – we have a wide range of working backgrounds and a huge breadth of experience, but there is one thing we all have in common, a passion for harnessing science to help people get the best from their brains.

Positive Group team collage

Positive Team

Dr Brian Marien

Dr Brian Marien

Co-Founder
Dr. Brian Marien is a trusted advisor to senior leaders, bringing a powerful fusion of medical expertise, psychology and neuroscience to help organisations enhance resilience, motivation and high performance at scale.
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Will Marien

Will Marien

Co-Founder and Chief Executive Officer
Will is passionate about workplace mental health and performance, and specialises in 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

Dr Sinéad Devine-French

Chief Science Officer
Sinead loves empowering people to think, feel and be at their best. She’s a chartered psychologist, with a wealth of experience across private, statutory and educational sectors. She has a strong interest in cognitive and behavioural approaches for sustainable change.
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Dr Catherine Marshall

Dr Catherine Marshall

Delivery Director
Catherine has a clinical and academic background, having worked as both a forensic psychiatrist and university lecturer. At Positive, she combines her experience and scientific knowledge to deliver engaging and thought-provoking sessions to clients across industries.
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Eloise Crush

Dr Eloise Crush

Head of Consulting
Eloise spent the first 10 years of her career in corporate banking and management consultancy roles, before returning to her passion: psychology. Her PhD focused on psychological resilience, and she specialises in protective factors for psychological wellbeing.
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Juliet Mooney

Juliet Mooney

Business and Client Operations Manager
Juliet has over a decade of experience in client operations, beginning her career in the finance industry before working across both the private and public sectors. She is passionate about supporting clients on their journey with Positive, ensuring excellence at every stage. She believes in the power of psychology to enhance performance and to help teams reach their full potential.
Jazz Croft

Dr Jazz Croft

Senior Science Communications and Research Manager
Since completing her PhD in psychiatric epidemiology, Jazz has worked with digital health start-ups to shape research and communication strategies. At Positive, she supports product development and translates psychological insights into story-led content.
Jo Rosen

Jo Rosen

Finance Manager
Jo supports finance at Positive, with international experience across the UK, Netherlands, and Australia. She previously led finance in an APAC tech firm and began her career as a financial analyst in global corporations across EMEA.

Emma Jones

Client Operations Specialist
With over five years’ experience in the public sector, and a Master of Health degree, Emma brings a foundation in organisational development and a passion for supporting health and wellbeing initiatives. Emma enjoys creating a seamless experience for both Positive’s clients and her colleagues.

Joselyn Hunt

Content and Design Assistant
Joselyn supports Positive in visually expressing our identity, purpose, and evidence-based teachings. Holding a BA in Graphic and Communication Design, she brings a background in pre-sales and a passion for translating complex information into clear, accessible content.

Oscar Treleaven

Senior Consultant
Oscar holds a Master’s degree in Psychology of Education and has experience applying learning theories across all levels of seniority within the private sector. At Positive, he assists in simplifying complex concepts to help clients identify effective solutions to challenging problems.
Dr Sophia Seltzer-Eade

Dr Sophia Seltzer-Eade

Internal Associate
Sophia is a Clinical Psychologist. She’s trained in a number of evidence-based psychological approaches, with a special interest in Cognitive Behavioural Therapy (CBT). She’s worked in a variety of clinical and business settings, and with client groups across the lifespan.
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Dr Alice Gee

Dr Alice Gee

Client Team
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.
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Clare Benka

Clare Benka

Client Team
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.
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Trish Pashazadeh-Allen

Trish Pashazadeh-Allen

Client Team
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.
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Francesca Bell

Francesca Bell

Client Team
Francesca is an executive coach and management consultant with deep expertise in leadership development, organisational transformation and behavioural change.
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Prof. Chris Wagstaff

Prof. Chris Wagstaff

Client Team
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.
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Georgia Bolton

Georgia Bolton

Client Team APAC
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.
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Simon Wilton

Simon Wilton

Client Team APAC
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.
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Emma Wellingham

Emma Wellingham

Client Team APAC
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.
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Colm Roche

Colm Roche

Brand and Design
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.

Interested in joining our team?

We’re often on the look out for passionate individuals, so take a look at our careers section for open positions.

Positive Careers

Scientific Advisory Board

Tom Sensky

Professor Tom Sensky

Department of Psychological Medicine at Imperial College London
Trudie Chalder

Professor Trudie Chalder

Cognitive Behavioural Psychotherapy at Kings College London
Paul Brown

Professor Paul Brown

Faculty of Organisational Neuroscience at Monarch Business School
Geoff Bird

Geoff Bird

Experimental Psychology at University of Oxford

Business Advisory Board

Alastair Aird

Alastair Aird

Global Chairman
Robert Howshall

Robert Howshall

Head of Product at LOQBOX
Ben Churchill

Ben Churchill

Chief Strategy Officer at Cool Planet Group