When Paul and the Sacher AI team joined, we had ambition but little clarity around AI, or behavioural change. Through his leadership, experience, and drive, that changed rapidly and meaningfully. Paul played a foundational role in shaping strategy. 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 work. Thanks to him, we were able to launch our AI-enabled lifestyle advice tool for patients. Alongside this,  What really stood out for me was how Paul, and the wider Sacher AI team, were able to bring the right people into the work. Whether through expert-led sessions, or by embedding top people, this input significantly accelerated our progress and helped upskill our own teams. Paul brings deep domain expertise, a highly collaborative spirit, and a bias for action. His impact at Numan has been profound … and lasting.

Jamie Smith Webb, CTO, Numan

"I give my highest recommendation to anyone considering working with Dr Sacher. 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 organization that is lucky enough to have his time."

Jeff Feldgoise

SVP Digital Product, Allurion Technologies

"The application and utilisation of data/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."

Robyn Glen

Digital Officer, Slimming World

"From the moment we hired Paul, it was clear that his wealth of experience in behaviour change, weight loss, and data science would greatly benefit our organisation, healthcare providers and patients. His transformative work in creating our behaviour change program...has had astonishing results. Our patients have been able to sustain 95% of their weight loss even 12 months after the program's end, which is truly an impressive metric considering the chronic nature of obesity."

Benoit Chardon

Chief Commercial Officer, Allurion Technologies

"Dr Sacher 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."

Prof James Stubbs

Professor of Appetite and Energy Balance at University of Leeds

"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."

Joe Ranft

VP Digital Product, Allurion Technologies

"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 program we have at Allurion today."

Dr Shantanu Gaur

Founder and CEO Allurion Technologies

"Dr. Sacher provided insightful, data driven, Behavioral 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 Allurion's ChatGPT virtual coach, including the strategy, prompt engineering, quality assurance, safety monitoring and the evaluation and interpretation of the performance metrics. 

Chris Martinez

VP Software Engineering, Allurion Technologies

When Paul and the Sacher AI team joined, we had ambition but little clarity around AI, or behavioural change. Through his leadership, experience, and drive, that changed rapidly and meaningfully. Paul played a foundational role in shaping strategy. 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 work. Thanks to him, we were able to launch our AI-enabled lifestyle advice tool for patients. Alongside this,  What really stood out for me was how Paul, and the wider Sacher AI team, were able to bring the right people into the work. Whether through expert-led sessions, or by embedding top people, this input significantly accelerated our progress and helped upskill our own teams. Paul brings deep domain expertise, a highly collaborative spirit, and a bias for action. His impact at Numan has been profound … and lasting.

Jamie Smith Webb, CTO, Numan

"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/outcomes were really thorough. I recommend them to other health technology innovators."

Grace Gimson

Cofounder and CEO of Holly Health