AI designed for real people and real-world risk



We help teams build and test AI systems that interact with people safely, responsibly, and at scale.

Teams we work with


We work with organisations designing, building, or deploying AI systems that directly interact with people.
Our partners include digital health companies, healthcare providers, and technology teams using AI to support behaviour change in high-stakes contexts.
We help teams identify behavioural and safety risks early, strengthen confidence in their AI systems, and support responsible use as those systems move toward real-world deployment and scale.


A selection of satisfied Sacher AI client logos

Our expertise


An example conversation between a person and an AI Health Coach Chatbot


At Sacher AI, we design and evaluate AI systems that influence human behaviour in safe, responsible ways.


We work with organisations across the full AI lifecycle, from early feasibility and prototyping through to evaluation and real-world deployment. Much of our work focuses on AI systems that interact directly with people, where behaviour change, trust, and safety genuinely matter.


Through our Research and Innovation Lab, we combine behavioural science, applied research, and AI development to help teams identify behavioural and safety risks early, and build confidence that their systems are fit for use in high-stakes environments.


Our work is supported by structured evaluation frameworks and tools, including PromptSafe, our proprietary platform for assessing AI-generated outputs against behavioural and safety criteria during development and testing. We are also developing independent safety oversight approaches designed to support scalable monitoring and assurance of conversational AI systems in health and other sensitive domains, extending evaluation beyond pre-deployment into real-world use.


With deep expertise spanning behavioural science, psychology, and AI safety, we help organisations build AI systems that align with how people actually think and behave, protect users, and perform reliably as they scale across healthcare and beyond.

Our approach


Discover


We work with your team to explore the real behavioural, user, and safety challenges your AI system needs to address. This phase focuses on problem framing, risk discovery, and understanding where AI may help or harm before design decisions are locked in.

Design


We co-design AI systems through a behavioural and clinical lens, shaping how they interact with people and influence behaviour. This includes early testing and iteration to ensure solutions are evidence-informed, appropriate, and safe by design.

Deliver


We evaluate and support AI systems as they move toward real-world use, using structured behavioural and safety criteria to assess readiness, guide iteration, and support responsible deployment at scale.

Client feedback


When the Sacher AI team joined, we had ambition but little clarity around AI, or behavioural change. Through Paul's leadership, experience, and drive, that changed rapidly and meaningfully. They played a foundational role in shaping strategy and helped us execute. Paul was instrumental in helping us build the teams that now lead our work. The Sacher AI team's input significantly accelerated our progress. 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

Button

"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

"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 the Sacher AI team joined, we had ambition but little clarity around AI, or behavioural change. Through Paul's leadership, experience, and drive, that changed rapidly and meaningfully. They played a foundational role in shaping strategy and helped us execute. Paul was instrumental in helping us build the teams that now lead our work. The Sacher AI team's input significantly accelerated our progress. 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

Button

"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

Read more feedback

Recent blog updates


By Sacher AI December 13, 2024
In the rapidly evolving landscape of artificial intelligence, generative AI has become synonymous with creating images, text and video. However, its potential extends far beyond content generation—it's revolutionising the field of behavioural science, opening up unprecedented opportunities for understanding and influencing human behaviour.
Coding
By Sacher AI October 4, 2024
In today’s fast-evolving landscape, blending AI with behavioural science is transforming industries—from healthcare to finance and legal—by creating solutions that not only advance organisational goals but also resonate deeply with individual users. At Sacher AI, our approach combines cutting-edge AI with insights from behavioural science, leading to tailored, effective, and responsible solutions. 
Human coaching which can be augmented with AI and Behavioural Science
By Sacher AI September 1, 2024
Behavioural science and AI are increasingly converging, driving significant advancements in digital health. Here’s why this combination represents the next frontier

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