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He and three other men were the founding members of the Parkinsonism Society of New Zealand - now known as Parkinson's New Zealand - which celebrated its 25th anniversary last year.
Mr Dunn, now living in Oamaru, is chairman of the board of Parkinson's New Zealand and recently returned from the seventh Asia Pacific Parkinson's Association Programme in New Delhi.
The title of the conference was Achieving Balance.
Various research papers were presented with Mr Dunn delivering a presentation on Parkinson's New Zealand.
Another conference - the second Asian and Oceanian Parkinson's Disease and Movement Disorders Congress - for health professionals, was run concurrently.
Parkinson's is a slowly progressive condition, which occurs when insufficient quantities of the chemical dopamine are produced by the brain.
This results in key neurological symptoms - changes in movement, balance and co-ordination.
Other changes in the body and brain may also occur.
Having grown from small beginnings, Parkinson's New Zealand provides education, information and support to people living with Parkinsonism conditions, their carers, families and health professionals.