Advisory Committee

The Be Well Medical Center’s Advisory Committee’s role is to advise our center on medical and organizational matters. The committee consists of medical professionals who have retired from practicing but are sharing their experience with our Thai family doctors and other medical professionals, e.g. by providing ‘second opinions’ within their field of expertise. Advisory committee members will neither consult nor treat patients.

Dr Bernardus (“Ben”) van Zoelen
Retired Cardiologist

Dr van Zoelen completed his medical studies at the University of Utrecht, the Netherlands where he specialized in Family Medicine. After working as a GP in the Internal Diseases and ER departments of a private hospital for one year, he decided to specialize in Cardiology at The Anthonius Hospital in Utrecht.

After becoming a licensed cardiologist Dr van Zoelen worked 30 years in the private hospital, “Het Diakonessenhuis” in Utrecht where he obtained in-depth experience a/o in bradycardia rythm disturbances, implanting over 400 DDD pacemakers. Dr van Zoelen also performed over 1000 coronary artery angiograms.

Dr Van Zoelen now resides in Hua Hin and advises the Be Well medical team on cardiovascular aspects.

Dr. Claus Petersmann
Retired Dentist
Member of the Dental Advisory Committee

Dr. Claus Petersmann studied medicines and dentistry at the universities in Marburg, Cologne, and Freiburg. He graduated as a dentist in 1981. In 1984 he obtained his doctoral degree at the Albert Ludwigs University in Freiburg with a thesis on oral pain management.  Dr. Claus started his career as a surgeon in the Zum Heiligen Geist hospital in Hagen where he practiced the various aspects of oral, jaw, and face surgery.

From 1984 to 2021 he practiced general dentistry in his own dental centers in Germany and Switzerland. During this period he specialized in implantology. Dr Claus is founding Member of the German Association of Oral Implantology and received a Ph.D. at the St Elizabeth University of Bratislava in 2011.

Dr. Daan Groenewegen
MD, retired General Practitioner

Dr. Groenewegen studied medicines at the Amsterdam University. In his first 5 years as physician he did internships in internal diseases and cardiology. However, as his real ambition was to be a General Practitioner (“GP”) he eventually obtained his medical license as “huisarts” (“family doctor”). In 1992 he established his own practice in Driebergen. Over the years he built & developed the Driebergen MC which became the leading primary health care location in town. Dr Groenewegen is co-founder of Be Well and his center in Driebergen provides knowledge and training to the Thai medical team.

Dr. Dick Zeilstra
Retired Neurosurgeon

Dr. Dick Zeilstra studied medicine at the University of Groningen followed by 3 years of residencies in general surgery, orthopedics, psychiatry and pediatrics, the latter in Perth. He then started a residency to become a neurologist, however, three months before completion he switched to neurosurgery, following his passion for surgery.

Dr. Zeilstra completed a PhD thesis on brain blood vessel anomalies at the University of Cologne.Registered as neurosurgeon he worked at the University Hospital Groningen and thereafter at a large teaching hospital in Zwolle.

The last 5 years of his career Dr Zeilstra worked in private clinics exclusively focused on spine patients. He has been a consultant to major companies on product development and operated & taught in many countries. Since 1998 he has been a visiting Professor to China and was awarded with the honorary citizenship of Rizhao and Shandong Province. In 2015 he received the prestigious Friendship Award from the Chinese government. Dr Zeilstra was (co)author of more than 40 articles in leading academic journals, on subjects related to both brain and spine.

Since retirement Dr Zeilstra resides in Thailand. He speaks Dutch, English, German, Russian, French, and basic Chinese.

Dr. Eckhard Maskos
Retired Specialist for Anesthesiology

Dr. Maskos studied medicine in Germany at the universities of Ulm and Tübingen. After completing his studies, he undertook further training to specialize in anesthesiology at the Army Hospital in Kiel (1980-1982), the University of Lübeck (1982-1985) and the University of Mainz (1985-1986).

From 1987-1992, Dr. Masko worked as a specialist in anesthesiology in Bremerhaven, Germany with a focus on anesthesia and surgical intensive care medicine, followed by outpatient anesthesiological activity from 1992-2009 in the doctor’s office for anesthesiology and pain therapy of a surgical day clinic in Freiburg im Breisgau.

Since 2010, he spends most of the year as a private / retired person in Hua Hin, Thailand.

In addition to a medical translation service for only German-speaking patients, Dr. Maskos will advise the Be Well Medical Center on anaesthesiological as well as acute pain therapy issues.

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Dr Gerard Smit
Retired General Practitioner

Dr Smit studied medicine at the University of Utrecht where he specialized in family medicine. In 1976 he established his own family doctor practice near Rotterdam, the Netherlands, until his retirement. From 1981 to 1992 Dr Smit was teaching medical students at the Erasmus University in Rotterdam in family medicine . From 1992 till 2006 he was training medical graduates from the same university to specialize as general practitioner.

Dr Smit was Chairman of the Association of Family Doctors in his region for a period of 6 years. After retirement Dr Smit and his wife decided to relocate to Hua Hin where they spend most of the year.

Dr Smit will advise the Be Well medical team on medical & social aspects of family health care.

Dr Peter B Dunki Jacobs
Retired Consultant Surgeon

Dr. Dunki Jacobs studied Medicine at the Amsterdam Free University (VU) and completed his surgical training also in Amsterdam. In Hannover Germany he attended his AO Trauma fellowship. He was General Surgeon in Haarlem and Trauma-surgeon at VUMC Amsterdam Trauma Center.

Dr Dunki Jacobs performed basic oncological research at the Netherlands Cancer Institute (NKI) and the Antoni van Leeuwenhoek Hospital Amsterdam, He defended his PhD thesis at the university of Amsterdam (UvA). The last 23 years of his surgical career Dr Dunki Jacobs spent working as surgeon consultant in The Alkmaar Teaching Hospital and Trauma Center, as Lung and Trauma-surgeon.

Throughout his career Dr Dunki Jacobs was lecturer and board member of the international teaching platform AIOD & Osteosynthesis and Trauma Care (OTC). Dr Dunki Jacobs is post doc certified governor / trustee (Erasmus University Rotterdam) and he ended his medical career as a Consultant Quality of Care and Innovation for the Dutch healthcare insurance company; ZilverenKruis Achmea.

Dr Dunki Jacobs has seen healthcare from different inside perspectives as well as from a patient’s point of view. Peter and his spouse Louise reside in Thailand during European winter months.

Dr. Stephan Jenzer
Retired Urologist

Dr Jenzer graduated as medical doctor at the Bern University in 1983. His dissertation theme was on bladder cancer which was an indication of his passion for urology. After four years of traineeships in pathology, surgery, internal medicine, and urology he started his specialization as urologist at the academic hospital in Bern where he focused on urological surgery. In 1994 Dr Jenzer became “Fachartz” in urology and Fellow of the European Board of Urology. He joined the urology clinic of the hospital of Luzern where he became Chief physician in 1997 while also being assigned as urological surgeon at two other hospitals in the region.

In 2001 he started his private urology clinic at the Salem hospital in Bern where he retired in December 2018. Since his retirement Dr Jenzer is based in Hua Hin where he spends the majority of the year.  He will advise the Be Well medical team on urological matters. Being fluent in English, German and French Dr Jenzer is also available to support Be Well and its Members for medical translations in German and French.



Dr. Thomas Lagger
Retired Dentist
Member of the Dental Advisory Committee

Dr Thomas is a graduate of the Eberhard Karls University in Tübingen, Germany, where he graduated as dentist in 1977 and completed his doctoral degree in 1978.

The first years of his career he dedicated to further training and research at the dental academy in Karsruhe.

In 1984 Dr Thomas acquired a general dental practice in Göppingen, South Germany, which he owned and operated till retirement in 2022. In this period, he specialized in fixed orthodontics and implantology.

Since his retirement Dr Thomas lives in Hua Hin.


Dr. Gurdeep (“Deep”) Dhatt
Retired pathologist

Dr Dhatt graduated as medical doctor from the Armed Forces Medical College in Pune, India. He completed his post graduate training in Chemical Pathology at the Westminster Hospital & Medical School in London.

His career as chemical pathology physician, scientist, teacher, and laboratory director spanned the UK, Germany, South Africa and the UAE.

Dr Dhatt has over 40 publications in peer-reviewed journals and was a reviewer for Clinica Chimica Acta, Clinical Biochemistry, CCLM and ACQAL. He is an inspector for the College of American Pathologists Laboratory Accreditation Program and ISO 15189.

Since his retirement in Hua Hin, Dr Dhatt advises our medical team on clinical laboratory  aspects of patient management and the quality, capabilities & efficiency of our laboratory.

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