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


Dr Chintal Patel

Dr Chintal Patel is an NHS General Practitioner (GP) working on the front line, caring for patients in London.  She completed a degree in Immunology and cell pathology before completing her medical degree at University College London in 2002. She is a trainer for Imperial College. She has a special interest in women and children’s health, lifestyle medicine and nutrition and writes content for various publications around these topics.

In her spare time, Chintal volunteers at London’s large vaccination centres. She also works with NHS England to help share information on mainstream media about the pandemic and the vaccine, reaching out to ethnic minority groups in particular.  She uses her knowledge of Immunology to break down information into digestible chunks for everyone to understand and uses her love of food and cooking to help share her health messages.

Outside of work, Chintal is keen cook and writes a cookery blog www.drchintalskitchen.com.  She loves celebrating food from all around the world and in particular, with her Indian Heritage, making Indian food and recipes accessible to all.  She lives in London with her husband and two children who can often be found cooking up a storm with her.  She is a keen skier and loves to travel, but now that the pandemic has restricted her globetrotting, she has found a new interest and love for gardening and growing her own produce.


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)’.


Tyler Kuhk, MN, ARNP

Tyler is a proud member of the nursing profession. He obtained his Bachelor of Science in Nursing from Lakehead University (Canada), initially working in critical care and cardiac intensive care. He then pursued a Master of Nursing degree from the University of Toronto (Canada) and transitioned into the nurse practitioner role, where he now specializes in pulmonology. His role includes the care of hospitalized patients (mainly patients with respiratory issues and those leaving the intensive care unit) and ambulatory patients with a variety of issues like asthma, COPD, chronic cough and interstitial lung disease. More recently Tyler has been following patients with PASC (long Covid) as well.

During the course of his career, Tyler has become passionate about combating health related misinformation, mainly related to vaccines and more recently COVID-19 and has built up a large Tik Tok following. He was also involved in the COVID-19 vaccination roll out at his organization where he was able to vaccinate hundreds of patients. Tyler’s passion extends to the clinical setting where he loves taking opportunities to educate patients – whether it be about their disease process, health promotion/prevention, or even debunking myths about vaccines (specifically influenza and COVID-19 vaccines!).

Outside of work, Tyler is an avid traveler (when Covid permits). He will find any excuse to get on a plane and visit somewhere (whether it’s Las Vegas or Europe). He also loves food, food and more food (and he will try anything once!). Of course with food comes the need for staying fit, and prior to the pandemic he was an Orangetheory Fitness fanatic! Recently, however he has fallen in love with his Peloton which has become a part of his regular routine. He also loves dogs and his current pride and joy is his pug, Titus. He is also a proud Canadian, now transplanted into the USA.


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 Ajay M Verma

Dr Ajay Verma is a Consultant Gastroenterologist and Physician working at Kettering General Hospital (KGH) in Northamptonshire, UK. Ajay treats patients with inflammatory bowel diseases and other chronic Gastroenterological disorders. He is an advocate for COVID vaccines, regularly posting social media content on the safety, efficacy and importance of vaccination for the benefit of patients, and fellow health care professionals.

Ajay has clinical interests in inflammatory bowel diseases, and early colorectal cancer. He is also an active clinical researcher and is the research and development director at KGH and the Gastroenterology Speciality lead for NIHR East Midlands clinical research network. Ajay is also a chief clinical information officer, a role he enjoys as KGH endeavours to be one of the most digitally advanced hospitals in the UK.  On a national level, Ajay is the chair of the New Consultants Committee at the Royal College of Physicians and sits on the SWiG (Supporting Woman in Gastroenterology) and Colorectal section committees for the British Society of Gastroenterology.  Ajay is active on Twitter, regularly posting #GastroTwearls: educational Gastroenterological content for health care professionals and patients.

Ajay enjoys spending time with family, his wife Vini is an Interventional GI Radiologist, his son Luca is 6, his daughter Bella is 4. He is a sports fanatic – Football, Cricket, Tennis, American Football. He plays badminton to a reasonable standard (his assessment). He also loves reading books – especially when on holiday!


Ashree Singh

Ashree is an advanced musculoskeletal practitioner and covid vaccinator in NHS primary care in London. After suffering from Covid-19 herself, Ashree developed a special interest in SARSCOV-2  and long Covid and its impact on the musculoskeletal system. She has since started working with Covid and post Covid sufferers in long Covid clinics in both NHS and private settings.  

Shocked and distressed with the misinformation surrounding Covid-19, Ashree started her own Facebook webpage called ‘’vaccine for infodemic’’ and made myth busting videos with other healthcare professionals from all over the world in English and various South Asian languages. She has also raised awareness about vaccine hesitancy among some healthcare staff, and helped to address vaccine hesitancy through mainstream media work including the BBC and various Indian TV shows. She regularly takes part in podcasts and webinars on these issues, and  has her own youtube channel focussing on Covid vaccinations, and managing Covid symptoms.

Ashree speaks English, Hindi, Urdu, Bengali and Odia. She is proud of her Indian heritage and loves East Indian cuisine, Bollywood movies, dance and music. She also loves British culture and the British weather!


Jeanine du Plessis

Jeanine du Plessis is a medical scientist working at the Vaccine and Infectious Disease Analytics (VIDA) research unit in South Africa. Currently she is working on multiple Covid-19 related studies including sentinel hospital surveillance, adult and paediatric Covid-19 associated mortality study and the Oxford vaccine trial – ChadOx-1. She has laboratory experience in forensic toxicology, microbiology and molecular biology.


Dr Bnar Talabani

Dr Bnar Talabani is a scientist and Wellcome Trust Fellow (Immunology) and a Clinical Academic Trainee (Nephrology & Transplant Medicine). She is currently doing a PhD in immunology looking at the role of inflammation in organ injury and scarring. 

Bnar helped to set up Muslim Doctors Cymru, a grassroots network of over 60 doctors across Wales, who provide information about Covid-19 and the vaccines in a range of languages, including Urdu, Pashtu, Punjabi, Bangla, Kurdish, Arabic, and Somali. The network also works with local authorities and mosques to build trust with local communities. 

Bnar speaks Kurdish & English. She was born in Northern Iraq and moved to the UK as a refugee, aged 10. She now lives in Wales with her husband and 3 year old daughter. She loves exploring the outdoors, cooking and spending time with family. 



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


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Shivani Kshirsagar


Arindam Ray


Chinthaparthi Prabhakar Reddy


Ed Belongia MD


Sheuli Porkess


Prof. Akiko Iwasaki


Kamran Zaman


Dr E Venkata Rao


Gayatree Mishra


British Society for Immunology


Arthur Caplan


Samantha Vanderslott


Dr Vedantha Srinivas J


Melvin Sanicas


Antoine Flahault


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.