Specialists in behavioural AI for health, safety, and real-world use
We support teams to design and evaluate AI systems that influence human behaviour, ensuring they are evidence-informed, safe, and appropriate for real-world contexts.
Meet The Core Team
Dr Paul Sacher
Founder, Lead Digital Health Clinician & Behavioural AI Scientist. Senior Lecturer (hon) at Imperial College and Co-Founder Behavioural AI Institute
Chris Reynolds
Chief Growth Officer and Senior Commercial Advisor. Has delivered exceptional growth in both SME and larger ventures
Dr Emmie Fulton
Lead Psychologist & Behavioural Scientist. CBT & science-based tools for mental well-being. Phd in Health Psychology
Gabriele Medeot
Machine Learning Researcher & AI System Architect. MSc in Artificial Intelligence
Jorge Alexander
AI & Digital Health Advisor. Entrepreneur and Co-founder of Syndi Health and others. MSc in Artificial Intelligence (Imperial).
Lev Perlman
FractionalChief Technology Officer. Senior Technical and Architecture Advisor. Prolific B2B and SaaS founder, and Mentor at Google for Startups. Founder of Metamindz
Our story and purpose
Scientists, engineers, clinicians, and psychologists working together to build AI for health and real-world use
Sacher AI is a healthcare technology organisation focused on advancing digital health through behavioural science, clinical insight, and applied AI development.
Founded in 2022 by Dr. Paul Sacher—a clinician scientist with experience spanning applied AI, behavioural science, obesity management, and digital health, the company was created to address a growing gap between AI innovation and real-world safety, effectiveness, and use.
Our team brings together expertise across science, engineering, and clinical practice to support organisations designing AI systems that interact directly with people. Alongside client work, we develop internal tools and evaluation approaches to help surface behavioural and safety risks, strengthen engagement, and support responsible implementation in practice.
Our purpose is to shape how human–AI systems are designed and evaluated, ensuring they are trustworthy, evidence-informed, and fit for real-world use in health and other high-stakes domains.
Dr. Paul Sacher, leadership in behavioural AI and digital health
Dr Paul Sacher is a digital health clinician and behavioural AI scientist with over two decades of experience designing, evaluating and scaling large-scale health behaviour programmes and human-facing AI systems.
As founder and CEO of Sacher AI, and co-founder of the Behavioural AI Institute, Paul leads work at the intersection of behavioural science, clinical insight, and AI safety. His focus is on how AI systems interact with people in real-world settings, and how behavioural and clinical risks can be identified and addressed during development and deployment. This includes leading the development of PromptSafe, a platform designed to support structured evaluation of risk and alignment in patient-facing AI systems.
Paul has contributed to the design and evaluation of large-scale conversational AI systems used in medication-supported weight management, and led the development of a peer-reviewed evaluation framework for generative AI in health, now applied internationally.
Previously, Paul co-founded and scaled MEND, a family-based obesity programme that supported more than 130,000 families worldwide. The programme was evaluated through multiple randomised controlled trials and recognised by public health organisations including the CDC and the American Academy of Pediatrics.
Paul has authored over 30 peer-reviewed publications, served as a principal or co-investigator on international research studies, and presented his work at conferences across the UK, EU, US, Canada, Australia, and Europe. He holds an honorary senior lectureship at Imperial College London.
Dr. Sacher's accomplishments
Developed global in-person and digital, health and wellness products and services, including:
- Key strategic, clinical and scientific lead for Allurions’s Generative AI Conversational Agent (chatbot) for weight loss patients (GLP-1s, bariatric surgery, intragastric balloons and lifestyle), designed to augment provider care. Available globally.
- Designed and led transformation of Slimming World’s UK, Ireland and USA digital patient platform. Built from the ground up for scalability and global adaptability. Managed budgets in excess of $6.1mil/annum.
- Led multidisciplinary product development and international program adaptation team (22 employees, 8 contractors in 3 countries), responsible for development of the largest suite of digitally supported family-based weight management programs and services, delivered to children and adults in 7 countries (UK, USA, DK, AUS, CA, NL and NZ). Recommended by CDC and American Academy of Pediatrics.
- Directed all stages of development of a successful health-span and longevity, precision medicine start-up, from inception to pilot.
- Over 27 years of healthcare and academic experience, working in clinical and research roles.
- Led research and evaluation strategies – leading to collaborations with 16 prestigious academic institutions in 6 countries, resulting in 36 peer-reviewed scientific articles, including 4 randomised control trials (gold standard research trials).
- Led Slimming World’s digital research agenda and strategy, resulting in participation in a €5mil, multi-country, EU trial, focused on development of mHealth technologies to support long-term behavior change. Selected by 13 research institutions as Exploitation and Impact Leader.
- Led Research of digital behaviour change coaching intervention and novel AI Conversational Agent, resulting in scientific publications and featured in multiple company press releases.
- Designed and contributed to qualitative evaluations, designed to provide deep understanding of people from multicultural and diverse communities across the UK, USA, AU and CA.
- Commissioned by Morgan Stanley International Foundation to conduct a multicultural community engagement and user needs project to guide implementation of their global Healthy Cities initiative.
- Generated and managed the largest child weight management dissemination dataset internationally.
- Established and chaired 3 international Scientific and Medical Advisory Boards.
- Appointed by Board to create and lead the Behavioural Science team at Allurion Technologies, listed on the NYSE. Led team of multidisciplinary experts, and Global Key Opinion Leaders. Behavioural Science subject matter expert for entire organisation.
- Co-founder of MEND (Mind, Exercise, Nutrition…Do it!), the largest and most effective provider of family-based, child weight management services. Grew MEND from a University spin-out to a multi-million dollar/yr revenue company, with a team of 60 employees in 3 countries (USA, UK and AUS).
- Successfully appointed by Slimming World (SW) Board for newly created role to spearhead the digital adaptation of SW’s hugely successful business (UK’s largest adult weight management organization). Directed all stages of development of SW’s global digital strategy and launch of USA ecommerce subscription service. Digital service grown to over to 1mil UK members.
- Following USA launch of MEND and SW, developed and led comprehensive, targeted, external affairs strategy, resulting in these previously unknown UK programs becoming well respected providers in the competitive USA weight management market.
- Single-handedly initiated industry 1st strategic partnership with Academy of Nutrition and Dietetics (100k members), to co-develop a reimbursable patient referral and feedback process.
- Key team member at Allurion Technologies pre-IPO.
- Catalyzed $45.7mil funding at MEND. Also, commissioned by US public agencies including Centers for Disease Control & Prevention, National Association of Community Health Centers. Worked with Blue Cross Blue Shield entities, Wellpoint, Kaiser Permanente and AmeriGroup.
- Grew MEND revenue to $6.4mil per annum via grants, partnerships, and funding awards.
- Led and/or contributed to 8 funding body research grants, resulting in $12mill research funding.
- External affairs: Featured and quoted in multiple company press releases (example press release).
- Masterclass: Key expert on AI for weight loss and coaching Allurion AI Masterclass.
- Scientific presentations: Invited speaker at 49 national and international conferences, including twice at International Congress of Obesity, World Diabetes Congress, British Medical Association 175th anniversary conference, Royal Society of Medicine and Oxford University.
- Peer-reviewed scientific publications: Published 26 peer-reviewed scientific publications (list of publications).
- TV: Health expert for Jamie Oliver’s Return to School Dinners. Co-presenter and expert on 4 series of BBC’s Honey We’re Killing the Kids. In addition, 60+ appearances on BBC, Sky, Channel 4, ITV.
- Press: 150+ interviews and quotes in national papers and magazines, including Time Magazine.
- Radio: 80+ interviews for national and regional stations.
- Books: Authored From Kid to Superkid (Vermilion) and co-authored 2 books with UK’s bestselling child health and wellbeing authors (Annabel Karmel, Gina Ford).
- Evidence: Invited to provide oral evidence at UK’s House of Lords Behavior Change Enquiry and Academy of Royal Medical Colleges obesity review.
- Corporate commissioned research: Morgan Stanley International Foundation, Healthy London evaluations, Slimming World Digital Transformation Report.
- Awards: MEND selected as the only scalable program to be included as part of the CDC Childhood Obesity Research Demonstration CDC Childhood Obesity Research Demonstration Project. Finalist in 2010 UK’s Chief Medical Officer’s Public Health Awards. Awarded British Dietetic Association’s most prestigious award for 2011.
Behaviourally informed AI, designed for safe and responsible real-world use.
