Our Team
We are Mason & Lanz, a team of professionals dedicated to making nutritional therapies available to everyone, everywhere. We work with researchers and medical professionals the world over, supporting them as we provide the best support for their patients. We also work with individual clients, delivering comprehensive education courses and nutrition coaching packages and programs based on the most up-to date and proven dietary interventions.
Partner
Nutritionist
Languages: English, German
Erin Maurer
As a nutritionist and behavior change specialist, Erin has undergone additional, clinical-level training in metabolic therapies for the management of chronic metabolic diseases which she uses in her roles as a coach, speaker, and educator.
​She works virtually and in person with clients located all around the world as well as in collaboration with globally recognized medical professionals and organisations.
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Erin is also a Co-Founder and Executive Board Member of the Nuvia Association for Nutrition and Health, as well as a Member of the European Renal Association.​​​​
Partner
Nutritionist, Naturopath, GAPS-P
Languages: Hungarian, English, French, Finnish
Orsolya Szathmari
Orsolya uses her combined expertise in her application of metabolic therapies, where she has years of experience working with tough-case clients seeking relief from severe symptoms resulting from chronic disorders and disease.
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She works internationally both virtually and in person with individual clients and in collaboration with internationally recognised medical professionals and organisations as a coach and educator.
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Orsolya is also a Co-founder of the Nuvia Association for Nutrition and Health, and a member of the European Renal Association.​​
Partner
Nutritionist, Personal Trainer
Languages: German, English
Ueli Lanz
Ueli is the founder of Ueli Lanz - Nutrition & Training, where he works as a Certified Nutritional Therapist as well as Personal Trainer & Strength Coach based in Zurich Switzerland.
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Through additional clinical-level training, he has specialized in the application of metabolic therapies, working with clients from many different backgrounds and health circumstances and in collaboration with professionals globally as a coach and practiced speaker.
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Ueli is a Co-Founder of both the Swiss Association for Ketogenic Metabolic Therapies SAKMT as well as the Nuvia Association for Nutrition and Health.​​​
Partner
Nutritionist, BSc Nutrition Science
Languages: German, English
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Yvonne Reuter
Yvonne is a nutritionist with clinical training in the use of metabolic nutrition therapies, as well training in diabetes management, food addiction, and eating disorders.​ As someone who successfully manages her own Type 1 diabetes with a ketogenic diet, she has particular insight into the needs of diabetic patients on insulin.
Yvonne works as a coach and educator both at home and abroad both with individual clients and in collaboration with professional organizations.​​
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She is also a Co-Founder of the Nuvia Association for Nutrition and Health, and a Member of the European Renal Association.
Medical Advisory Board
Our Medical Advisory Board is a team of distinguished healthcare professionals committed to providing expert guidance and ensuring the highest standards of medical excellence throughout all of our programs. Our board members bring a wealth of experience and specialized knowledge to support our mission of advancing health and well-being for all.
Dr Penny Figtree
MD, General Practitioner
Australia
Dr. Penny Figtree graduated with first-class honors from the University of Sydney in 1993. After over 20 years in general practice, she chose to specialize in weight loss and diabetes management. This shift was inspired by witnessing the effectiveness of a low-carbohydrate diet in helping patients lose weight and, in some cases, even reverse diabetes. Now she uses low-carb nutrition therapies in her practice, helping patients reduce medications and achieve real improvements in their health.
Dr. Figtree is a regular speaker at widely publicized medical conferences, where she discusses the efficacy of low carb nutrition therapies in the treatment of patients.
Dr Timur Liwinski
MD, General Practitioner, Resident in Psychiatry
Switzerland
Dr Timur Liwinski completed his medical degree and received his doctorate from the University of Münster in Germany. He underwent further training in Internal Medicine and worked as a postdoctoral researcher in Hamburg and Israel before specializing in Adult Psychiatry. Since June 2023, he has been a Clinician Scientist and Principal Investigator at the University Psychiatric Clinics Basel. He is board certified as a General Practitioner in Switzerland with upcoming board certification in Psychiatry.
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Acknowledging the limitations of medical treatments for noncommunicable diseases, he seeks to leverage the benefits of nutrition and lifestyle interventions to address both physical and mental health.
Dr Alexandre J. Pelouze
MD, Resident in Cardiac Surgery
Switzerland
Dr Alexandre Pelouze is a medical professional specializing in cardiac surgery at the University Hospital of Geneva. He has completed multiple residencies with upcoming board certification in Cardiac Surgery in Switzerland. Dr Pelouze earned his medical doctorate from Semmelweis University in Budapest, Hungary, and holds advanced degrees in cellular and molecular biology from UPMC Paris.
He has become increasingly concerned about the decline in the general population's health. Recognizing the significant relationship between poor health and nutrition, he has developed a special interest in a comprehensive approach using nutrition to help in the treatment of cardiovascular disease.
Barbara Contzen, RD
Registered Renal Dietitian
Germany
Barbara Contzen is a highly specialized renal dietitian with years of experience working with kidney patients. In addition to working with patients, she travels throughout Europe, presenting at medical conferences, training medical professionals, and advising medical faculties. She is an active member of both the DGEM Guidelines Commission and the Nutrition Commission of the DGfN.
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Barbara believes that low carb and ketogenic whole food therapies have an important place in helping improve kidney function and treat kidney disease. She’s dedicated to collaborating with healthcare professionals to make these therapies safely accessible to more patients.