Jan de Vries, considered one of the most renowned and well-respected naturopaths, has died after a battle with ill health.
Dr de Vries, who had treated political leaders, film stars, sports personalities and members of the royal family, had a long-running clinic on the Lisburn Road in Belfast.
He was a columnist for the Belfast Telegraph and a regular on UTV's Kelly Show in the 1990s where he helped people with their health issues.
A post on his Facebook page on Wednesday said: "It is with sadness that after a battle with ill health, Jan de Vries died peacefully on the morning of Tuesday 7th July 2015."
Born in the Netherlands in 1937, he graduated in pharmacy in 1958 before moving to the UK where he lived and worked for over 50 years.
In 2005 he told the BBC the story of how he came to live in Scotland.
He said: "In 1944 a plane was shot down above our place. It landed in the river, the bodies were dredged out of it and the schoolmaster asked me to look after the grave of the navigator.
"Eventually the navigator’s family came over to visit the grave and they were always asking me to come and stay with them in Scotland. I said that I would but not until I’d finished my studies.
"So after I graduated I went to Scotland and was asked to a dinner where I sat next to a young lady. That lady is now my wife and has been for more than 45 years. We suffered a lot in the war but that was one of the benefits that came out of it.”
After marrying he went into pharmacy with his wife before meeting Swiss naturopath Dr Alfred Vogel during a lecture in Amsterdam.
In his memoir, he looked back over a long and fruitful working relationship with Dr Vogel.
"He converted me from the orthodox field of medicine into a totally new way of thinking for me, alternative medicine, which was ‘original’ medicine. In the beginning of 1961 we opened our very first clinic for nature cure in Holland."
Dr de Vries family said that donations to the Renal Unit of the Crosshouse Hospital in Kilmarnock are preferred over floral tributes.
R.I.P Jan de Vries my dear friend and colleague who passed away this morning— Paul Maconaghie (@Paulmac48) July 7, 2015
Sad to hear of the death of Jan de Vries - a leader in alternative medicine who helped many...— Victoria O'Hara (@vicoharabelfast) July 8, 2015
So sad to hear Jan de Vries has passed away. He was an amazing man, a great pioneer for natural health and our industry. May he #RIP— Healthstore girl (@Healthstoregirl) July 8, 2015
We are very sad to hear of the passing of the industry legend Jan De Vries, a peer we learnt a lot from— Nat Healthcare Mag (@NatHealthMag) July 8, 2015
Saddened to learn of the death of Jan de Vries.....— Essence Health Store (@EssenceHealthNI) July 7, 2015
From the archives: Jan de Vries Answers Your Questions