Our team

We are proud to be a Great Place to Work Certified™ company


We know your business

We’ve been doing market research for years and have helped to launch some of the most successful healthcare brands in the world.

We make it easy for you

We are resourceful, flexible and responsive. We aim to be an extension of your team and exceed your expectations.

We deliver impact

We deliver business impact, through our strategic advice, activation workshops and engaging multi-media outputs.

Here’s some of the brilliant people you will get to work with across our UK and US offices


Abigail Stuart
Founding Partner

Abigail has more than two decades of experience consulting with healthcare companies to develop global brand strategies and communications. She has helped to launch some of the world’s most successful blockbusters, as well as working with life-changing medicines for rare-disease and health tech start-ups. Prior to starting Day One, she had successful career as a Global CEO of a leading a healthcare brand and communications research agency, responsible for growth across Europe, US and Asia.

People describe Abigail as creative, determined and strategic.

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Hannah Mann
Founding Partner

Hannah has 23 years of experience in pharmaceutical research both on the client and agency side. Throughout her career she has been lucky enough to work on some of the world’s largest pharmaceutical brands – seeing them through from early-stage development all the way to launch and beyond. Hannah has also deep expertise in the area of vaccination (paediatric, adult and travel) built up over the last 15 years from both the agency and client side.

People describe Hannah as fearless, hard-working and fun.

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Elise Roche

Elise has over 15 years of experience in the research industry – with the first 5 years in FMCG and then specialising in pharmaceutical market research across a range of methodologies after that. She is responsible for many of Day One’s biggest client relationships and leads the agency’s focus on delivering excellent client experiences. Elise’s passion for understanding human behaviour is evidenced by her secret passion for reality television (Shhhhh….don’t tell anyone).

People describe Elise as bright, diligent and efficient.

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Claire Macchia

With over 20 years of global healthcare research and brand building, Claire has helped to shape the launch trajectory of some of the biggest brands in healthcare. Bringing equal parts curiosity, intellect and creativity, she had led engagements that have redefined go-to-market strategies and refreshed more mature brands in ‘user-chooser’ categories such as aesthetics, vaccines and wellness to high science brands in autoimmune, cardiometabolic and oncology. As an expert listener, she loves designing and guiding conversations that bring fresh discoveries to both respondents and her clients.

People describe Claire as smart, empathetic, driven and creative.

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Ben Lorkin
Senior Research Director

Ben has 17 years healthcare experience and has worked for several leading insight-based brand consultancies. Ben specialises in qualitative research and has extensive pre and post launch experience across a range of methodologies, including ethnography, patient journey, communications research and drivers and barriers. Ben is a qualified NLP practitioner and is passionate about behavioural science and pioneering the use of new thinking and approaches – leading qualitative innovation at Day One and in several of his previous companies.

People describe Ben as strategic, creative and curious.

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Dennis Grady
Operations Director

Dennis has more than 16 years of experience in market research operations and project management, including 10 years focused wholly on healthcare research. He is responsible for leading the operational side of Day One’s US business to ensure seamless project delivery across a variety of methodologies and therapy areas. Dennis is known to have a checklist for just about everything which serves him very well both professionally and in one of his favorite hobbies, flying (it’s not a secret superpower… he has a private pilot certificate).

People describe Dennis as being inquisitive, practical, and organized.

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Nate Weaver
Senior Research Director

Nate blends an extensive background in biomedical research (with 13 years of research experience in biotech and academic labs) and strong business acumen with strategy consulting and market research. He has particular expertise in market landscape assessment; primary market research with physicians, pharmacists, KOLs, and patients through quantitative and qualitative methods; commercialisation strategy; launch planning; and competitive intelligence. His education and work experience have given him specific therapeutic expertise across oncology (solid tumour and hematologic malignancies), respiratory (including COPD and asthma), regenerative medicine, neurologic & psychiatric indications, and rare disease.

People describe Nate as curious, generous, and caring.

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Hayley Mangan
Senior Research Director

Hayley has over 20 years of Insight experience– the first 10 years working in FMCG, consumer health and B2B specialising in brand strategy and ethnographic approaches to insight generation. Her enjoyment in consumer health research led her to seeking a career in health Insight. Hayley thrives on building great relationships, be that with clients or gaining the trust of patients and HCPs she talks to. She enjoys challenging projects, especially brainstorming the answers to tricky business questions. She is known for her ‘can do’ attitude, flexibility, openness to embrace new methods and being focused on the ‘so what’ for clients.

People describe Hayley as motivated, collaborative and thoughtful.

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