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


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 Michael Mrozinski

Dr Michael is a General Practitioner based in Australia. He graduated from the University Of Glasgow and worked as a GP before moving to Melbourne. He also works as a senior lecturer/tutor at Monash University and has a passion for teaching. During the pandemic he has been working on the front line, administering vaccines and working in fever clinics as well as his general practice work. He has also been helping fight the misinformation on social media for the last year and has been a regular on ABC news in Australia as well as featuring in national newspapers. 

Michael completed a Masters in Sports and Exercise Medicine and has represented Scotland and Australia as a national team doctor, working with the under 17s, 19s and 21 football teams. He has been the medical lead for over 20 football tours and has worked at 2 Commonwealth games. Outside of work, he enjoys watching and playing football. He has a passion for music and sings and plays the piano and guitar, and he even made an appearance on the X factor UK in 2013!


Dr Tasnim Jara

Dr Tasnim Jara works as an A&E doctor in the NHS and studies evidence-based health care at the University of Oxford. As a frontline clinician, Tasnim regularly supports her patients to make evidence-based decisions about COVID-19 vaccines. Alongside fighting the pandemic, Tasnim makes short videos in Bangla to tackle covid and vaccine related misinformation. So far, her health awareness videos have been viewed for more than 280 million minutes and she has gained more than 1.5 million followers on Facebook and YouTube. Tasnim also made strategic partnerships with media, business, NGO, faith leaders, and government institutions to further broaden reach. The Business Standard named her one of 7 changemakers of 2020.

Tasnim has co founded a health-tech startup called Shohay with the aim to disseminate reliable healthcare information in Bangla.


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!


Dr Kiran Morjaria

Dr Kiran Morjaria is a junior doctor and comedian based in Manchester. He is working on the front line admitting and treating patients with Covid-19. In his spare time he volunteers at a Covid-19 vaccination hub as a vaccinator.

Kiran graduated from Leeds Medical School in 2017, where he was awarded the SPARK scholarship for enterprise, and is currently training to be a GP. He has performed comedy across the national circuit and continues to make medicine accessible and fun online.

Kiran’s big passion outside of medicine is comedy. He also enjoys staying active, he is a keen gym-goer, tennis player and vegetarian foodie.


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 in Soweto.


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 Will Budd

Will is a Clinical Research Physician at Imperial College London. After graduating this year in medicine, Will had to shield for most of the first wave of the coronavirus because of a Renal Transplant he received in 2016. Instead of working on the hospital wards he is running vaccine trials, assessing eligibility, vaccinating participants and following them up. The facility he works in is trialling both the Oxford and Imperial Covid vaccine candidates.



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


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Beate Kampmann


Mariet Feltkamp


Michel Kazatchkine


Gayatree Mishra


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Dr. George Kassianos CBE


Prof. Akiko Iwasaki


World Medical Association


Arindam Ray


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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.