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Featured Guides

These volunteers are making short videos on TikTok and Instagram to explain their part in the vaccine effort.


Professor Galit Alter

Galit is Professor of Medicine at Harvard Medical School where she specializes in the study of antibodies. Her lab, located in the Ragon Institute of MGH, MIT and Harvard where she is a Group Leader, studies immune responses to Covid-19 vaccine candidates to help the design and selection of those that will give the most protection against the disease. A two-time recipient of the prestigious Massachusetts General Hospital Research Scholars Award, Galit was elected a member of the American Association of Microbiology in 2019.


Juan Ambrosioni

Juan Ambrosioni MD, PhD is a specialist for the HIV / AIDS Unit and Infectious Disease Service and Assistant Professor of Medicine at the University of Barcelona. He is also an infectious disease specialist for the University of Buenos Aires, Argentina and the University of Geneva, Switzerland. Juan is involved in the Infectious Disease Service of Hospital Clinic-IDIBAPS, which runs the SARS-CoV2 vaccine project ‘Development of innovative coformulated mRNA vaccine against SARS-CoV2 (Cova-RNA)’.


Dr Mohan Sekeram

Dr Mohan Sekeram is a NHS General Practioner in Southwest London. He is currently a regional lead for Personalised Care supporting individuals make decisions around what matters to them. This has been invaluable during current times in addressing concerns of our community. 

Mohan has been involved in the vaccination roll in his local borough and in particular coordinating the volunteers. He has worked regularly in the vaccination hubs and involved in many webinars educating local community around vaccine facts. Mohan has also co-ordinated community outreach clinics to increase uptake. 

Mohan loves spending time with his family and enjoys many sports. He is a keen runner and support AFC Wimbledon.


Dr Paul F. McKay

Dr Paul F. McKay is a Senior Fellow at Imperial College in London who designed, made and tested Imperial’s self-amplifying RNA Covid-19 vaccine. Paul has worked in the vaccine development field for almost 30 years, completing his PhD at Imperial College and postdoctoral training at Harvard Medical School. His focus is studying the immune response to vaccine candidates, aiming to enhance or tailor the immunity to increase vaccine efficacy and creating new vaccines to various infectious diseases.


Andrea Mazzella

Dr Andrea Mazzella, MRCP (UK), is a Research Physician working in the NIHR Guy’s and St Thomas’ Biomedical Research Centre, and one of the investigators of three Phase III clinical trials investigating the Janssen, Novavax and Oxford/AstraZeneca vaccines for Covid-19. His role involves discussing the trials with volunteers, assessing their eligibility and conducting follow-up and pharmacovigilance with hundreds of trial participants.

After qualifying from medical school in Italy with an Erasmus exchange programme in Spain, Andrea moved to England to work as a doctor in the NHS. Once he completed Core Medical Training, he studied at London School of Hygiene and Tropical Medicine for a master’s degree in Epidemiology. It was during this year that the COVID-19 pandemic unfolded; he graduated and decided to join the team of researchers working on COVID-19 vaccine clinical trials.

Andrea grew up on a tiny island in the Mediterranean and loves returning home and sailing. He has a geeky passion for linguistics and is powered by dark chocolate and nonna’s struffoli.


Dr Gigi Osler

Dr. Flordeliz “Gigi” Osler is a Canadian Otolaryngology-Head and Neck surgeon, an assistant professor at the University of Manitoba, and a past President of the Canadian Medical Association (CMA).  While at the CMA, she had a profound impact on the profession, influenced medical women across Canada, and led the development of the CMA’s first ever policy on equity and diversity. She also has leadership roles with the Canadian Medical Forum, the Federation of Medical Women of Canada, the Canadian Society of Otolaryngology-Head and Neck Surgery, and the International Federation of ORL Societies.   Dr. Osler is the recipient of numerous honours and awards, including the University of Manitoba Distinguished Alumni Award, the Association of Faculties of Medicine of Canada May Cohen Equity, Diversity and Gender Award, and has been named to WXN Canada’s Top 100 Most Powerful Women List and the Medical Post’s Power List.  

The pandemic has shown that when there is a need for health information, the public is hungry to eat it up. When there is a void, it gets filled with disinformation to the point that intelligent people can believe the misinformation. Dr Osler has been active on Tik Tok, Instagram and Twitter since the start of the pandemic. Since social media was where people were getting their information from, she felt it was important for scientists and health professionals to use those same platforms to provide accurate information and health news.  

Dr Osler is a mother, dog mom, and wife. She loves family, laughter, food, and travel (do we even remember what travel is?). She wants to change the world for the better – one small act of kindness at a time, one day at time, together.


Dr Jamie Parker

Dr Jamie W R Parker MBBChir MRCGP MA (Cantab) is a General Practitioner (GP) based in Nottingham and working in the NHS, helping deliver the Covid-19 vaccines to his patients.

Jamie has been a Senior GP for 10 years, he trained at Cambridge University, and became a fully qualified GP through the Nottingham Vocational Training scheme, in 2010. 

On the first day of lockdown, March 2020, Jamie wrote and performed a cover of Disney’s Frozen hit “Let it Go”, “Stay at Home” on his Twitter account. He did this to try and help publicise the importance of the ‘stay at home’ message and social distancing in preventing the spread of the coronavirus. The song went viral, and before he knew it, he was on local and national TV and radio, including Sky News, The Chris Evans Breakfast Show and BBC1, being dubbed ‘Nottingham’s singing doctor’. Jamie has since become a regular GP sofa guest on the BBC breakfast show, appearing weekly throughout the pandemic, trying to spread important messages in a calm and measured way.

Jamie lives with his family and three children in Nottingham, and loves the outdoors, sport, and music.


Dr Alex Bowmer

Dr Alex Bowmer is a medical anthropologist and a Research Fellow at the London School of Hygiene and Tropical Medicine, working on understanding the social dynamics of epidemics and the facilitators and barriers to vaccine deployment in epidemic outbreaks. After completing his PhD, he has spent the past two years working on Ebola, Rift Valley Fever, Swine Fever, and now Covid-19. 

Outside of his work on Covid-19, he also works in professional sport as a physical therapist and strength & conditioning coach with teams in the USA and UK. 



Follow the people working on all aspects of science that will make these coronavirus vaccines safe and effective


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Paolo Bonanni


Prof. Akiko Iwasaki


Elisa Ramos Sevillano


Institute for Health Metrics and Evaluation


British Society for Immunology


Jyotiranjan Sahoo


Majdi Sabahelzain


Naveen Thacker


Mary Kesteffens


Kamran Zaman


Dr Sanjay K Rai


Dr Vedantha Srinivas J


Dr. George Kassianos CBE


You can help too

Thousands of volunteers around the world are signing up to help trial these vaccines to make sure they’re safe and effective.

Find a trial near you


Team Halo is an effort to support and celebrate the inspiring collaboration between scientists all over the world to help us end this pandemic with safe and effective vaccines.

The ‘halo’ represents the ring of connected science that circles the globe.

All participation is voluntary. If you’re involved in the vaccine search and would like to be listed on this site, please get in touch.

Team Halo was established as part of the United Nations Verified Initiative in partnership with The Vaccine Confidence Project at the University of London’s School of Hygiene and Tropical Medicine. It is proud to collaborate with the Vaccine Alliance and GAVI. Support is provided by Luminate and IKEA Foundation.