0views across social media

Follow these scientists working to get us safe and effective Covid vaccines. Ask them anything.

TikTok Twitter

Featured Guides

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


Dr Gustavo Cabral

Gustavo leads the team that is developing a Brazilian vaccine for Covid-19 at the University of Sao Paulo. His work also focuses on vaccines for the Chikungunya and Zika viruses. His research centres on the use of “virus-like particles”, which was the focus of his postdoctoral studies at the universities of Oxford in the UK and Bern in Switzerland.


Dr Simone Richardson

Dr Simone Richardson is a postdoctoral fellow in the Antibody Immunity Research Unit, University of the Witwatersrand and the National Institute for Communicable Diseases in Johannesburg, South Africa.

Simone’s work is focused on understanding how antibody function contributes to protection against COVID-19. Her team is focused particularly on how these can be used to protect HIV infected individuals from COVID-19. They are currently measuring these in South African vaccines to better understand which functions of antibodies are associated with vaccine protection.

Simone is a 2020 L’Oreal UNESCO postdoctoral fellow awarded for her work on COVID-19, and, an early career fellow of both the HIV Vaccine Trials Network and the Collaboration for AIDS Vaccine Discovery. She holds a diploma in science communication from Stellenbosch University and is passionate about lending her voice to science. 

Outside of work, Simone loves to cartoon, hike and read manga and historical non-fiction – never at the same time. She often can be caught being a total kid and building some form of Lego or annoying her Yorkshire Terrier. 


Dr Katrine Wallace

Dr. Wallace holds a Ph.D. in Epidemiology and has 15+ years of professional research experience in epidemiology, research design, pharmacoepidemiology, health economics, outcomes research, and biostatistics.

She is currently working as an epidemiologist and adjunct assistant professor of epidemiology at the University of Illinois at Chicago, School of Public Health.

​Dr. Wallace also serves as a consultant to non-profit health organizations, the pharmaceutical industry, and managed care companies. 

She has been an invited speaker in the US and internationally, and has presented research at over 20 scientific congresses.

Dr. Wallace has also been featured in several mainstream media outlets such as; Good Morning America, National Public Radio, and Parade Magazine


Dr Walid Zaher

Dr Walid Zaher is the Study Director of 4Humanity clinical trials and Chief Research Director G42 Healthcare. As study director of #4Humanity, the world’s first phase III clinical trials of inactivated vaccine for COVID-19, Dr Walid has a unique vantage point from where he will be sharing his personal experiences and updates to keep the world informed on developments from the UAE and partnering trials nations; Bahrain, Jordan and Egypt.

Dr Walid is also an adjunct Associate professor at the College of Medicine and Health Sciences at United Arab Emirates University, with more than 30 ISI publications in reputed journals including Nature and Stem Cells. Dr Walid’s previous posts include Corporate Group Clinical Research & Innovation Director at Abu Dhabi Health Services Company (SEHA). He was also the General Director of the College of Medicine Research centers at King Saud University (Riyadh, Saudi Arabia), a consultant for the Saudi 2020 national biotechnology and infectious disease plan, and an assistant professor of regenerative medicine and stem cells. 

Dr Walid graduated with MBBS from Saudi Arabia with a residency training in Obstetrics and Gynaecology, followed by Master degrees in Medical education, Anatomy, Embryology and Bioscience technology. He holds a PhD in regenerative Medicine from Denmark, and has 1.5 yrs of laser-medicine training attachment at Harvard-MGH (Boston-USA). He has been a recipient of prestigious awards such as the King Saud University Research Prize Award for Outstanding research, King Saud University, Riyadh, KSA (2017).


Sean Elias

Sean Elias is working as part of the Covid-19 vaccine trial team both in the lab and as part of the SciComms team at the Jenner Institute, University of Oxford.

Sean is a postdoctoral immunologist and  ‘Public Engagement with Research’ (PER) leader based. He has a keen interest in the human immune system with previous work on T cells, B cells and antibodies for various diseases including Malaria, Ebolavirus, Salmonella and now Covid-19. On the SciComms front, Sean has a keen interest in developing educational materials for schools and the general public, in particular through the medium of board games. During the pandemic he has also provided photos, videos, explainers and most recently GIFS to the world’s media on behalf of the Covid-19 vaccine research team.

When not in the lab Sean is a keen triathlete, cricketer & football player, avid board gamer and lover of ALL things Star Wars.


Natali Serafin

Natali Serafin a research scientist working at the Vaccine and Infectious Disease Analytics (VIDA) research unit in South Africa. Natali’s expertise includes project management, epidemiology, and clinical medicine. She is currently managing a sentinel Covid-19 surveillance taking place at Chris Hani Baragwanath Academic Hospital in Soweto.


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.


Nathan Peiffer Smadja

Nathan Peiffer-Smadja is a physician specialised in Internal Medicine and Infectious Diseases, a fellow of the French Society of Infectious Diseases, a PhD candidate in Public Health and a Honorary Clinical Research Fellow at Imperial College London. He is currently living in France and has worked on the Covid-19 Vaccine for over 6 months.



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


Kamran Zaman


Vipin M. Vashishtha


Dr E Venkata Rao


Dr Sanjay K Rai


Naveen Thacker


Sandeep Panigrahi


Sheuli Porkess


Majdi Sabahelzain


Rajeev Venkayya


Prof Madhu Gupta


Melvin George


Ragon Institute


Michel Kazatchkine


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.