Client feedback

I had the pleasure of working closely with Paul and the Sacher AI team during a pivotal period at Numan. When Paul joined, we had ambition but little clarity around AI, behavioural change, or research. Through his leadership, experience, and drive, that changed rapidly and meaningfully.

Paul played a foundational role in shaping strategy across all three domains — not just as a strategic thinker, but as someone who helped us execute. He was instrumental in helping us build the teams that now lead our AI, behavioural medicine, and research work. Thanks to him, we were able to launch our AI-enabled lifestyle advice tool for patients and initiate Numan's first formal research projects.

Paul brings deep domain expertise, a highly collaborative spirit, and a bias for action. His impact at Numan has been profound — and lasting.

Sacher AI quickly felt like an extension of our team. Due to the strength of their behavioural science, LLM, and healthcare expertise, they were able to quickly understand our behavioural science approaches and AI intentions, and help to build something impactful. User safety was prioritised and the operational tests to check the interactions and outcomes were really thorough. I recommend them to other health technology innovators.

I highly recommend Dr Sacher for any organisation seeking to elevate the science behind their value proposition and transform long-term patient satisfaction. From the moment we hired Paul and the Sacher AI team, it was clear that their wealth of experience in behaviour change, weight loss, and data science would greatly benefit our organisation, healthcare providers, and patients.

Their transformative work in creating our behaviour change programme — delivered via an app to our patients — has had astonishing results. Our patients have been able to sustain 95% of their weight loss even 12 months after the programme's end, which is truly impressive considering the chronic nature of obesity. Paul's expertise has been instrumental in this achievement. However, it is his collaboration skills and exceptional customer acumen that truly set him apart.

I give my highest recommendation to anyone considering working with Dr Sacher. For the past several years we worked together day-to-day, studying and building digital weight management software and programmes. Dr Sacher has been an inspirational colleague, generously sharing his extensive knowledge of behavioural science and academic research in the weight management space. Dr Sacher is a true thought leader, playing an instrumental role in defining how we could best bring the power of AI effectively and safely to our products. He will bring huge value to any organisation that is lucky enough to have his time.

Dr Sacher is one of the most talented and driven experts in nutrition, behavioural medicine, and lifestyle modification in the field today. A widely published scientist in his own right, he has a great command of a highly dynamic research field that is changing by the day. He is also a thoughtful and kind leader who knows how to assemble teams that march toward the same goal. It was a pleasure working with him to build the best-in-class programme we have at Allurion today.

Dr Sacher is the rare expert who combines a deep understanding of the latest academic research with a knack for crafting impactful digital experiences. Smart, patient, and empathetic, he played a pivotal role in building and launching Coach Iris, our AI weight loss coach. His expertise defined the strategy, evaluation, and coaching approach, ensuring Coach Iris delivers meaningful, accurate, and safe guidance for our weight loss patients.

Dr Sacher provided insightful, data-driven, behavioural science-based subject matter expertise for patients and providers. His impact on the development of our predictive AI model helped identify patients who were at risk of not achieving their weight loss goals, leading to earlier intervention. Dr Sacher also played a key role in developing our AI virtual coach, including the strategy, prompt engineering, quality assurance, safety monitoring, and the evaluation and interpretation of the performance metrics.

I have worked with Dr Sacher for over 5 years. He has a unique and highly valued skills set that enables him to operate extremely effectively across academic and commercial settings to drive the translation of basic research into practice in the areas of digital technologies, behaviour change, weight management, and health promotion. He is a fantastic team player and helps bring science to the real world in a way that changes the lives of millions of people. His excellent communication and analytical skills help different experts work together to develop new solutions for societal problems.

Dr Sacher brings fun, creative thinking, and energy to anything that he is working on. He's passionate about health-related behaviour change and how digital tools play a role. The application and utilisation of data and clinical evidence throughout the product lifecycle can be hard going, but Dr Sacher has a flair for really bringing insight to life and using evidence to inspire and engage leadership and delivery teams. As an expert in health, wellness, product development, clinical evaluation, and digital, Paul is a fabulous person to have within or alongside a senior leadership team.