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Our Trustees




Vivienne Whittingham - Chair

Vivienne Whittingham

I am currently a Service Manager for Adult Community Social Work in Hammersmith and Fulham and I have practised as a social worker in the Borough of Hammersmith & Fulham for more than twenty years. I have been involved with River House and it’s service users since it’s inception.


I am privileged to be Chair of the Board of Trustees and I am committed to ensuring that River House continues to thrive as a dynamic community resource.




Dean Nicholson - Trustee

Dean Nicholson

I qualified as an Psychiatric Nurse in 1982, which is the same year I met my partner. After working at St Thomas’s for a year we set up our own residential home in Cambridgeshire for the elderly. During this time I trained as an HIV counsellor and helped to set up and run the Cambridge HIV (AIDS) help line. This involved face to face counselling as well as answering the phones. I was Chairman for about 2 ½ years but unfortunately had to step down as my partner became unwell. We sold the home and moved back to London. After a period of illness my partner passed. I took a year out and did some travelling.


I joined Priory Hospital in 1997 and I am currently the Therapy Services Manager for the hospital, work I immensely enjoy. I have done quite a bit of training in different types of therapy since starting with them. And I’m fortunate enough to be able to see patients as well as run the services.


I was delighted to join River House's Board in January 2012.




Mark Nelson - Trustee

Professor Mark Nelson

Professor Nelson is a consultant physician at the Chelsea and Westminster Hospital, London. He trained at Jesus College, Cambridge and Westminster Hospital medical school from where he qualified in 1986. He was appointed Consultant Physician at this hospital in 1991 and a senior lecturer at Imperial College Medical School in 1996. Since that time he has built a large HIV practice with a special interest in HIV in patient care, co-infection with hepatitis B and C and the clinical utility of new antiretroviral agents.


 Dr Nelson sits on the Executive Committee of the British HIV Association where he is co-chair of the guidelines committee for opportunistic infections and the treatment of hepatitis C. He is a member of the Guidelines Committee for Malignancy and Hepatitis co-infection. He is chair of the BHIVA hepatitis special interest group and the newly elected chair of the BHIVA science and education committee. He is a trustee of several charities associated with HIV including the International Association of Physicians in AIDS care (IAPAC) and St Stephens AIDS Trust, a charity committed to the improvement of life for all those living with HIV where he is head of overseas development and education. As such, he leads on doctor exchanges and educational projects in several African and Asian countries. He has been awarded a  visiting professorship at the Aga Khan Hospital, Nairobi, Kenya and most recently the certificate of merit by the government of Vietnam.


David Mummery

David Mummery has been a GP in Hammersmith and Fulham for ten years having previously worked in the HIV/GU medicine unit at Charing Cross Hospital.

He has a longstanding interest in HIV care in Primary Care and enjoys working in close collaboration with hospital colleagues, other healthcare professionals and others in the voluntary sector.











Professor Mark Bower PhD FRCP FRCPath

Mark is a consultant medical oncologist at Chelsea & Westminster Hospital and Professor at Imperial College who specialises in the treatment of AIDS related malignancies.

He has developed one of the largest centres for the management of these tumours in Europe, receiving referrals from throughout the UK and has cared for over 3,000 patients with HIV-associated cancers.

His clinical research covers the epidemiology, aetiology, pathogenesis and management of these tumours. He has a laboratory programme studying the immunopathology of these tumours in collaboration with a number of basic scientists.

He is a scientific advisor to UNAIDS



Dr Michael Rayment

Mike is a Consultant in Sexual Health and HIV Medicine at Chelsea & Westminster Hospital, and works at 10 Hammersmith Broadway, the Kobler Clinic, and on the Ron Johnson inpatient unit.

He is interested in the interplay between sexual health and HIV, sexual difficulties, HIV seroconversion illness, and HIV testing and prevention.


He helped establish a routine service of HIV testing patients attending the Emergensy Department at Chelsea and Westminster, offering the opportunity of an HIV test to all people attending the Department. The scheme has helped to diagnose more than a hundred people living with HIV and all are now accessing specialist care.

Mike is an avid teacher, and helps to lead the Imperial College medical school mocule on sexual health, HIV, and infectious diseases. He is also a member of the St.Stephens AIDS Trust Education Committee, and runs programmed designed to increase knowledge and awareness of HIC and sexual healthissues for local primary and secondary healthcare providers.

He is delighted to have joined the Board at River House.



Sheena Basnayake 

Sheena is the Deputy General Manager for Sexual Health, HIV & Dermatology at Chelsea & Westminster Hospital NHS Foundation Trust.

She is a senior operations leader and a nurse by background, with 20 years’ post-registration experience gained developing and delivering evidence-based and patient-centred services within hospital and community settings. Her clinical expertise is in infectious diseases and public health. Sheena leads large teams to provide seamless, multi-professional, and specialist care. She is interested in leading and facilitating change, teaching multi-disciplinary stakeholders, and innovating and improving clinical practice.