Meet Yazen’s Expert Team

Dr. Angelica Brandelius, MD, PhD, is a licensed physician and certified medical trainer with a background in immunology, clinical research and more than 15 years of experience in exercise and health. At Yazen, she develops digital solutions that help people build and maintain an active lifestyle.

Anna Sommerfeld is a molecular biologist by training and has more than 25 years of experience in the pharmaceutical industry, including roles at AstraZeneca, Roche and Gilead Sciences. As the founder of Mealsizer®, she has spent the past 14 years working closely with both obesity and eating disorder care, translating research into practical solutions for better health.

Christina Waller Sterner has extensive experience in international brand building and sales, with senior roles at Essity, Mölnlycke Health Care and Diaverum. She has also worked as a consultant, supporting health startups and serving on several boards.

David Buchebner, MD, PhD, is a specialist in endocrinology. He is Quality Assurance Manager at Yazen Health and contributes with scientific expertise in endocrinology and metabolic disease.

At Yazen, leadership means empowering others. It’s about creating trust, welcoming ideas, and encouraging innovation. We’re here to make a lasting difference in people’s lives, and that starts with building a culture of collaboration, science, and care.

‍

Elinor Medhammar is a Registered Dietitian with experience in medical nutritional therapy and lifestyle interventions in primary care, research projects, and a specialist clinic for childhood obesity. At Yazen, she works on developing lifestyle programmes and app content to support patients in their weight journey.

Jesper Wallén has a background as a journalist, editor, and writer. At Yazen, he plays a central role in the company’s communications work. Through his content creattion, he helps make modern obesity treatment more understandable and accessible to more people. He’s passionate about making complex topics easy to understand.

My work centers on translating real-world training and wellness insights into clear, actionable concepts that drive product development, consumer behaviour, and long-term healthy habits. Johan Calmerskog, a fitness and wellness entrepreneur with two decades of experience across gym operations, supplements, and consumer health, blends practical training expertise with a structured approach to creating products that simplify routines and support sustainable wellbeing.

As Sweden’s Country Manager and head of Yazen’s Consumables business, he also leads partnerships that expand the company’s European reach. His focus is consistent throughout: turning genuine wellness insights into products that help people maintain lasting wellbeing.

Kajsa Asp Jonson, Licensed Dietitian (RD), is a nutrition specialist, journalist, and author with over 20 years of experience in evidence-based communication on diet, lifestyle, and long-term health.

‍

‍

Lina is a licensed physician and specialist in general medicine, educated at Lund University, Sweden. She has more than 10 years of experience working in digital healthcare through Min Doktor and Blodtrycksdoktorn.At Yazen, she works as Head of Operational Excellence, focusing on developing digital healthcare from both the patient’s and the physician’s perspective.

Linda Cronberg is a registered dietitian with a Bachelor’s degree in Sports Science and has over 25 years of experience in healthcare and social care, 15 of which have been focused on lifestyle and behavioural change in relation to overweight and obesity. At Yazen, Linda works as a Medical Copywriter and Content Developer, and is also involved in the development of the company’s own nutritional supplements.

Magdalena Einarsen Adam has an international background in marketing and digital communication. She has a strong interest in how language and culture shape communication and understanding. At Yazen, she works with storytelling and content strategy - helping make modern obesity treatment more understandable and accessible.

Magnus Nyhlén, physician, entrepreneur and founder of Yazen. He has more than 25 years’ experience in building companies within digital healthcare and education.

Martin Carlsson is a physician, Associate Professor and specialist in endocrinology. He is co-founder and Chief Medical Officer at Yazen Health, with a research background in type 2 diabetes, overweight, obesity and the digitalisation of healthcare.

Nicolas Dhondt is a licensed psychologist with a specialist focus in neuropsychology. He has experience in psychosis care, brain injury rehabilitation, and vocational rehabilitation. At Yazen, Nicolas works with psychological counseling and assessment, and he also supervises coaches in complex patient cases.

Oliver Willacy is a medical doctor and holds a PhD in Women's health from the University of Copenhagen. Founder and CEO of Medstart, a pioneering medical weight loss clinic in Denmark, which joined Yazen in 2024.

Sofie Franke is a licensed psychologist specializing in neuropsychology. She has experience in both digital and traditional therapy, as well as in neuropsychiatric assessments.At Yazen, Sofie provides psychological counseling and assessment, and supervises coaches working with complex patient cases.