Petros is about Resilience

Established by a small group of highly experienced and qualified forensic and educational psychologists, we work across diverse sectors and contexts.

We offer assessment, training, intervention, professional supervision, coaching, and consultancy and all our team have worked within large organizations, as well as independently.

We are also all parents.

Jo Clarke PhD, C.Psychol., AFBPsS, EuroPsy HCPC Registered Forensic Psychologist

Founder and Director

During 23 years of working in the criminal justice system, Jo’s attention has focused on the concept of resilience, both for individuals and the organizations in which they live and, or, work.

For criminal justice staff, questions about surviving and thriving in roles that often involve exposure to potential trauma led Jo to undertake a PhD in the area. Since its completion in 2004, she has worked with a wide variety of organizations and individuals applying research evidence to practice, to enhance psychological well-being.

In 2003, Jo became accredited to deliver The Challenge of Change resilience training; an evidence-based intervention developed by Dr. Derek Roger of the Work Skills Centre. Jo is a regular speaker, both nationally and internationally on the subject of individual and organizational resilience and has authored a number of chapters and papers on the subject.

Since 2013, Jo has been working with challenging and disruptive children. Training with Dr. Ross Greene in the application of The Collaborative and Proactive Solutions (CPS) model, Jo is committed to finding ways of enhancing the resilience skills so often lacking in such children, whilst also supporting parents, carers and professionals charged with their care. Jo is the first person in the UK accredited to deliver the one-day CPS programme. Jo is also currently an external examiner for the MSc in Forensic Psychology and Mental Health at Queen Mary’s University, London.

A mum of a now adult daughter and foster carer of teenagers, Jo also has a menagerie of animals, including a registered therapy dog and two horses in training to assist in interventions with children.

Di Gammage - Petros People - good mental health for all

Di Gammage MA HCPC Registered Dramatherapist & UKCP Registered Child & Adult Psychotherapist\r\n

With 25 years’ experience working in the area of trauma and abuse, Di is a State Registered Dramatherapist with the Health and Care Professions Council (HCPC), the British Association of Dramatherapists (BADth) and Play Therapists (BAPT).  Di was invited onto the UK Council for Psychotherapy Child Register via the Northern School of Child Psychotherapy in recognition of her clinical experience and publications in child therapy. Her adult training is in Buddhist Psychotherapy.  Di has been Co-director of Sirona Therapeutic Horsemanship Project, Devon, and has published and presented on the benefits of equine therapy, particularly for looked-after children who have experienced attachment breakdown. She lectures on the Terapia Child and Adolescent Psychotherapy programme in London and currently chairs the Viva panel at Terapia.

Her interest in resilience has developed over years of practicing as a psychotherapist and clinical supervisor.

Di and Jo met as mums-to-be and their now grown-up daughters have also forged a deep friendship. Di also has a adult son, cameraman partner and her own collection of cats, horses and Mopperley the dog.

Maxine Daniels - Petros People - good mental health for all

Maxine Daniels  DPsych., BSc (Hons),
BPA registered Senior Trainer, UKCP registered Psychotherapist

Maxine has been an Associate with Petros for the past 5 years and really enjoys the work. She currently works as an Independent Consultant and Clinical Supervisor for the NHS, Broadmoor Hospital, Elysium Healthcare and the Priory Group.  She completed her Doctorate in Psychotherapy at Metanoia/Middlesex University in 2012.

Maxine originally trained as an actress and went on to teach drama workshops in colleges and prisons. She qualified as a psychodrama psychotherapist in 2002.  Maxine has consistently combined her arts background with clinical practice and business. She set up her own business, using drama-based learning and role play in organizations, which included clients such as St Thomas’s Hospital, Colgate/Palmolive, Philips Electronics, Lord Chancellor’s Dept, South East Rail Network, to name a few.   In 1991 a paper was published titled: ‘The use of role play in teaching medical students obstetrics and gynaecology’ Coonar, Dooley, Daniels & Taylor,  highlighting the use of actors in medical training, which led to an explosion of drama-based learning and the use of role-play in business.

During the last 25 years Maxine worked for HMPPS (Her Majesty’s Prison & Probation Services) where she consulted and developed offending behaviour treatment programmes and trained staff across the prison service establishment.   This work has taken her to America, Scandinavia and Ireland. She is published in this field and has presented at many conferences both nationally and internationally.

Maxine currently teaches on the Doctorate for Counselling Psychology and Psychotherapy programme and is an Academic Adviser for the Doctorate by Professional Studies at Metanoia.    She teaches in Hong Kong on behalf of the London Centre for Psychodrama. She works in private practice and is registered with UKCP, MBACP and BPA professional membership bodies.

She is married to a professional musician and has two daughters, one who is following in her father’s footsteps by playing jazz trumpet, and her other daughter who is training to be a primary school teacher.

Ed Simpson - Petros People

Ed Simpson

Ed joined the Police Service in 1995, initially working for West Yorkshire Police in his hometown of Bradford, before transferring to North Yorkshire Police in 2003. Ed then remained at North Yorkshire Police until his retirement in 2016 on medical grounds, following a prolonged battle with Post Traumatic Stress Disorder (PTSD) and depression.

During his service Ed was well known for his caring and compassionate policing style, maintaining a victim focus and, through his work as a dedicated Neighbourhood Police Officer, always striving to bring local communities together.

Ed was also a Police Family Liaison Officer working with families whose loved ones had died as a result of road traffic Collisions, murder or manslaughter. It was dealing with one particular family’s grief that Ed developed PTSD. However, it wasn’t until four years later, in 2012, while Ed was working as a Custody Sergeant in York, that this developed into a severe episode of depression that almost cost him his life.

On return to work Ed took the decision to be open with colleagues about why he had been absent (not something spoken about in the emergency services at that time). He expected to be the only sufferer, but he found quite the opposite to be true.

Ed now speaks about his career experience to audiences all over the country, working closely with the national mental health charity MIND on their Blue Light program, aimed at raising awareness and challenging the stigma of mental health illness within the emergency services. Despite his eventual medical retirement, after 21 years’ experience as a Police Officer, Ed continues to tell his story to public and private organisations, to educate, inform and inspire. 

Importantly, Ed is also a stay-at-home-dad with two school-aged children, both of whom love to provide him with plenty of new daily challenges.

Laura Vialle - Petros Administrator

Laura Vialle

Business Manager

Laura is likely to be the person you speak to or connect with about training, event bookings, course programmes, diaries and logistics. Laura is also part of the marketing and communication support.

The admin glue for many years, local to York and with a young family, Laura ensures people are where they’re supposed to be, meetings diaried, deadlines are met and rooms booked, together with so much more!  Please feel free to get in touch if you have any queries and Laura will respond as fast as she can!


Ned Hoste FRSA

Brand and communications

Ned started his first business at 14, then at 15 as a professional designer on a national magazine and has never lost the buzz. After studying Graphic Design at art college for 4 years moved on to work in-house at a London publisher. He set up 2H design in 1986 and has worked on book projects for all the mainstream UK publishers and many international projects with authors as diverse as Kirk Douglas, Jeffrey Archer, Jilly Cooper and The Rolling Stones.

In 2007, Ned set up the Big Ideas Collective (BIG), with co-director Jacky Fitt; a virtual agency specialising in brand development and articulation of brand messages on and offline. We work with businesses all over the UK working long term with companies and organizations helping to build brands based on values. BIG has won 2 major green awards for their business model, The Green Dot Award in 2008 and the Green Award from Investors in the Environment in 2016.

The BIG philosophy is to work with sustainable businesses with a particular interest in social enterprises that understand that enterprise has to work in balance with the social, and without the enterprise the social part of the business will not be sustainable.

2014 BIG launched The Big Ideas Library to publish Independent authors book to the standard of the mainstream publishers.

Ned now also runs TEDx workshops and spoken on the Goldman Sachs 20K small business programme on the good business module and is ILM qualified. He is also the co-founder of the online short story community.

Proud father of Katy and partner of mosaic artist Alison Hepburn, Ned has known Jo since Katy and Madi were about 6 months old.

Jacky Fitt

Jacky Fitt FRSA

Content and Social

Award winning author, editor and copywriter, Jacky’s work is all about listening, understanding and articulating ideas and concepts through words; persuasive, engaging and informative. Raising profiles and profitability online and in print. Co-founder and Director of The Big Ideas Collective with graphic designer Ned Hoste, Jacky is also Social and Digital Editor of on online arts subscription website. A TEDx speaker, Jacky’s first book, How to Get Inside Someone’s Mind and Stay There won the 2015 Small Business Book Community Choice Award in Marketing. The book, now fully revised for 2018, is currently published by Business Expert Press in the US.

Jacky is a mum of two amazing young women who are a constant source of love, exhaustion and fun (but mainly fun).

Sophie Brigstocke, PhD, C.Psychol., AFBPsS\r\n HCPC Registered Educational Psychologist

Dr Sophie Brigstocke has over 15 years’ experience offering comprehensive assessments for children and young people experiencing specific learning difficulties or difficulties engaging in the classroom. She is passionate about the importance of ensuring that assessments are strengths based, focusing on what children CAN do well, and offering recommendations, supported by research evidence, on how these strengths can be promoted and used to support areas that are more challenging. 

Sopnie also works for the Anna Freud Centre,  offering training for teachers on promoting resilience and supporting mental health difficulties in school all over the UK. She also had an interest is supporting children with Autism, offering educational services at The Retreat’s service for children and young people with Autism in York on a sessional basis.

With an ongoing interest in research, teaching on the DPsych Counselling at York St Johns, Sophie also worked for over 10 years as a lecturer part time at The University of York on Assessment and Treatment of Developmental Disorders. For the past five years Sophie has delivered advanced level professional training to teachers on best practice in supporting children with special educational needs at the University of Hong Kong, funded by the Bureau for Education.

On a regulatory level, Sophie has full professional indemnity insurance, transferable, online, enhanced level DBS clearance to work with children and young people and has safeguarding and data awareness training each year, as well as professional supervision to ensure she meets full requirements to work with children independently and go into schools. She is also on the HCPC register for Practitioner Educational Psychologists and an Associate Fellow of the British Psychological Society. She had a doctorate in psychology, MSc in Reading, Language and Cognition, a PGCert in CBT for children and young people and is ADOS trainee to clinician level and completes continuing professional development regularly to ensure she is up to date on the latest cutting edge knowledge and techniques.

Sophie is also a mother to two school-aged children and has hands-on experience of the challenges and rewards of bringing up a family.

Tracy Brookes, MSc., C.Psychol., HCPC Registered Forensic Psychologist

With a background in Forensic Psychology and two decades working within the criminal justice system, including prison, mental health and wider community, Tracy is chartered by the British Psychological Society (BPS) and registered by the Health Professions Council (HPC).

Tracy has been involved in both the assessment and treatment of offenders, delivery of national training to a range of professions and become involved in supporting other trainee psychologists in their route towards qualification with the BPS and HPC.

More recently, Tracy has worked as a Lecturer at The University of York which led to her contribution to a publication. She continues to work directly with offenders and staff, working as a practitioner in a medium secure unit.

It is through her experiences of working with offenders, as well as being a parent to two school-aged children, which has led to her desire to improve the support offered to challenging children and their parents!

Rebecca Milner, PhD, MSc., C.Psychol., AFBPsS

HCPC Registered Forensic Psychologist

Rebecca is a Chartered and Registered Forensic Psychologist with over 20 years’ experience of working within the criminal justice system. Rebecca’s focus has been on the assessment and treatment of offenders, designing national treatment and training programmes and the clinical supervision and training of staff. Rebecca is trained in a variety of risk assessment and intervention methods and has conducted applied research in the field. She is committed to evidence-based practice and the evaluation of therapeutic interventions.

Having worked as a lecturer at The University of York, and also having completed her PhD examining the process of desistance in male offenders, her interests now focus on young people who have become involved in the criminal justice system. She currently provides clinical supervision to staff working with young offenders.

Rebecca is also a mum to two school-aged boys who provide her with an abundance of fun and interesting challenges.

Claudine Bowyer-Crane PhD, C.Psychol

Claudine studied Psychology at the University of York. In 1999 she joined the Centre for Reading and Language as a PhD student in to study children’s reading comprehension.

Following this she carried out a Post Doctoral Fellowship investigating children’s reading and language intervention.  Since that time her research has focused on developing, implementing and evaluating school based interventions to support children’s early reading and language development.  Most recently she has been working on research focused on supporting children learning English as an Additional Language. While at the Centre for Reading and Language, Claudine worked in the clinic carrying out assessments for children with specific learning difficulties and providing recommendations for support.  Like other members of the Petros team, Claudine firmly believes in identifying children’s individual strengths and areas of difficulty in order to provide appropriate and effective support.

Claudine is now a member of the Psychology in Education Centre based in the Department of Education at the University of York.

• She is programme leader for the BSc Psychology in Education.

• She is continuing to develop work in the area of reading and language intervention.

• She is also a mum of two.