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

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


Dr Soha Albayat

Dr. Soha Albayat is Head of Vaccination at Qatar’s Ministry of Public Health, and national lead for the Covid-19 track and trace team. Soha is also on the vaccination planning committee and regularly follows up with covid-19 vaccine developers and manufacturers to stay updated on the progress of trials.


Dr Vicky Baillie

Vicky is a senior researcher at the Vaccine and Infectious Disease Analytics (VIDA) research unit in South Africa. Vicky has extensive laboratory experience in both microbiology and molecular biology and is currently one of the lead scientists on the Oxford-AstraZenica vaccine trial in South Africa. She is also the scientist overseeing several Covid-19 surveillance trials taking place at Chris Hani Baragwanath Academic Hospital in Soweto.


Dr Paul Ian Cross

Dr Paul Ian Cross is a subject matter expert in clinical trials at the National Institute of Health Research (NIHR) in England. Paul leads on the development of learning materials for doctors, nurses, researchers and scientists involved in the research response to Covid-19 and is also a clinical trials auditor. He has a background in Microbiology and completed his Master’s degree and PhD at Cardiff University. Paul is involved in several science communication projects across healthcare and STEM (science, technology, engineering, mathematics) education. Paul’s passion is writing STEM-inspired books and creating STEM content to introduce children and their families to the wonders of science.


Dr Omon Imohi

Dr. Omon Imohi Md MRCGP DFSRH is a multiple award-winning NHS Family physician. She is involved in supporting the roll out of the Covid-19 vaccine and has been raising awareness around the vaccine to educate people on it’s importance, and to empower them to make informed decisions.

Omon attained her first degree at Windsor University School of Medicine (MD). She is a member of the Royal College of General Practitioners UK (MRCGP) and a Diplomate of the Faculty of Sexual and Reproductive Health (DFSRH). She is an Elected council member of the Royal College of General Practitioners. She is also a GP community tutor for Liverpool University.  

Omon is the founder of BWIH (Black Women in Health) a non-profit organisation born out of the need to connect, inspire, empower, and celebrate black women in healthcare in the UK. She was recently featured in the spring edition of the RCGP frontline magazine. Also featured in the September 2020 edition of the Royal College of Physician Magazine. She was awarded GP of the year 2019 by the Royal College of General Practitioners North West Faculty and won multiple audit awards, which have been published in the NICE guidelines as shared learnings. 

Omon is a self-starter with motivation, commitment, and drive to inspire and empower people to transform their lives by unleashing their maximum potential and achieving their dreams. She is a transformational speaker, a certified Life coach, Author and wife with 2 kids. 


Dr Asher Williams

Dr Asher Williams is a Trinidad & Tobago National Scholar, Presidential Postdoctoral Fellow at Cornell University, with a PhD. in Chemical Engineering at Rensselaer Polytechnic Institute (RPI). The goal of her current research is to simplify vaccine manufacturing in low-income countries by creating a cell-free synthetic biology platform for the biosynthesis of conjugate vaccines. For now, she is focused on vaccines against emerging pathogens.

Asher was named a Class of 2020 Changemaker at RPI and earned a B.Sc. in Chemical & Biomolecular Engineering at New York University in 2015, then worked as a NASA bioengineering research intern. 

Asher was awarded an RPI Presidential Graduate Research Fellowship and during her graduate career she mentored several graduate and undergraduate students, presented at research conferences, and published over 10 co-authored papers in peer-reviewed journals, with a patent pending. Additionally, she served as Vice President of the Black Graduate Students Association at RPI, working on initiatives to increase the recruitment and retention of minority students in graduate education. 

Originally from Trinidad & Tobago, Asher loves cooking and working out.


Dr Sarah Merrifield

Dr Sarah Merrifield is a Doctor and Clinical Lecturer in Manchester. In her role as a General Practitioner, Sarah is proud to be part of the Covid-19 vaccine delivery effort in her local area. She has provided medical cover for vaccination sessions, answering queries, and providing support when needed. Having seen the worry that some of her colleagues and friends faced, she set out on a personal mission to deliver evidence-based information about the vaccines on social media.

Sarah is passionate about education, has a postgraduate certificate in Medical Education and is a fellow of the Higher Education Academy.  Sarah is keen to ensure medical information is communicated in a way that is easy to understand and authentic. She won a science communication prize a few years ago with a talk on “Ben Stiller’s Prostate”. 

Sarah began her career as a GP receptionist, which inspired her application to Medical School. After graduating from the University of Sheffield in 2011, she continued her postgraduate training in Yorkshire, gaining full qualification as a GP in 2019.  Sarah has undertaken a variety of work during her career including providing medical cover for a field trip to Ecuador, blogging and demonstrating anatomy.

Outside of work, Sarah enjoys spending time with her husband and 2 bunnies. She normally partakes in lots of travelling, amateur dramatics, pub quizzing and theatre trips. She cannot wait to get back to these as soon as possible. She is a proud northerner from the UK and currently lives in Manchester.


Dr Natalia Pasternak

Natalia is a microbiologist specialising in molecular genetics of bacteria. She currently works as a visiting researcher at the University of Sao Paolo, at the Vaccine Development Laboratory. She is the Director-President of the Instituto Questão de Ciência (“a question of science”) and an outspoken advocate for scientific thought in public life. She is a columnist for the newspaper “O Globo” and is a regular media commentator on Covid-19 in Brazil.


Dineo Thaele & Matshidiso Sello

Dineo and Matshidiso are demographers working at Wits Vaccines Infectious Disease Analytics (VIDA) Research unit in South Africa. They are screening and testing for Covid-19 in the township of Soweto and informal settlements in Thembelihle as part of a wider child health programme. They are assessing the impact of Covid-19 on community access to healthcare, livelihoods and education. Information that may help ensure distribution of a vaccine is as effective as possible. 



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


Debasis Nayak


Paolo Bonanni


Prof Katie Ewer


Antoine Flahault


Dr. George Kassianos CBE


Elisa Ramos Sevillano


Abraham Flaxman


Shivani Kshirsagar


Otavio Ranzani


Rajeev Venkayya


The Vaccine Confidence Project


Ritudhwaj Tiwari


World Medical Association


Satyajit Mohapatra


Michel Kazatchkine


Jyotiranjan Sahoo


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 in partnership with the The Vaccine Confidence Project at the University of London’s school of Hygiene and Tropical Medicine. It is proud to collaborate with the UN Verified Initiative and Gavi, the Vaccine Alliance. Support is provided by Luminate, IKEA Foundation and the Global Challenges Foundation.