Senior management



Dr Arun Dhandayudham, Medical Director and Chief Executive Officer

Arun has been a Consultant in Addictions Psychiatry for over 10 years in both the NHS and the Third sector.

He trained in Psychiatry in Oxford and Cambridge before becoming Clinical Director of the NHS addiction services across Northamptonshire and Bedfordshire. He then worked at CRI before joining WDP as Medical Director in January 2015. 

A keen interest in management led to an MBA at Henley Business School and membership of the Faculty of Medical Leadership and Management. Arun has extensive experience of setting up and running community drug and alcohol services, prison substance misuse services and dual diagnosis services.

He continues to be actively involved in the Royal College of Psychiatry Addictions Faculty where he is Coordinator of the Regional Representatives network as well as Chair of the Addictions Faculty Patient and Carer group. His research interests include pain management, online shopping addiction and chronic arousal states such as anxiety and their impact on addictions treatment. 

Arun is also a specialist inspector for the Care Quality Commission (CQC).


Screen Shot 2016-06-13 at 11.02.31_0.pngSri Muthukumaru, Head of IT

Sri has over 20 years experience in the IT industry. Since 2004, he worked as Head of IT in public and voluntary sectors such as the Multinational Charitable Housing and Care, NHS and Higher Education Sectors. He has an MSc in Information Systems & Engineering from Southbank University and a BEng (Hons) in Electronic & Communication Engineering from the University of North London.
Sri provides innovative solutions for everyday work environments in order to effectively achieve the vision and objectives of the organisation. He has extensive experience in core IT technical skills, management of staff, projects, programs, budgets, IT & Office procurement and IT Contracts; IT strategy planning and implementation, business analysis and development, planning and design of IT infrastructure, merging IT departments and systems and restructuring and outsourcing IT services. 
Sri currently serves as the General Secretary at Croydon Academy of Eastern Art where he previously worked as an Education and Welfare Officer.

Screen Shot 2016-06-20 at 11.53.05_0_0.pngSimon Marshall, Head of Workforce

Pragmatic and commercial in his approach, Simon has been a member of the WDP management team for over 11 years.

With over 20 years of HR management experience Simon has previously worked in the FMCG, financial services and recruitment sectors.

Simon leads our Human Resources and Learning and Development teams to support the effective recruitment, retention and development of our people.


Graham Howard, Head of Commercial Development

Graham has been working in substance misuse business development for over seven years. Within this time, he has secured multiple high value substance misuse contracts.  Prior to this, he worked in the welfare-to-work sector which involved directly supporting the long-term unemployed into sustainable work.  He also studied languages at university and is fluent in French and Portuguese.  Graham is responsible for driving our strategic growth agenda.