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

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Featured Guides

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


Dr Ayede Ologun

Dr Ayede Ologun is a General Practitioner in Manchester, England. Her day to day consulting has been largely influenced by the pandemic and roll out of the vaccine, answering questions and addressing concerns regarding the vaccines and being trained in vaccine delivery. 

Ayede is a Clinical Supervisor and an OSCE Examiner. She sits on the Royal College of General Practitioner North West Faculty Board as the Treasurer and Lead on Mid-Career GPs. She is the General Secretary of Black Women in Health, UK. She is a motivational speaker and a Life Coach.

Outside work, Ayede is a Life coach, coaching women on embracing their authenticity so they can be their best selves and give their best to others. Ayede also speaks at medical events and gives motivational talks. She loves watching Korean dramas and listening to Korean music artists (BTS and Blackpink). She also likes travelling to new places, trying new dishes and cultures, gardening when she can and most importantly, spending time with her family. 


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.


Gabriel Carrasco

Gabriel is Co-Director of the Health Innovation Lab at the Institute of Tropical Medicine “Alexander von Humboldt”, Universidad Peruana Cayetano Heredia in Peru and a PhD candidate in Public Health at the University of California, San Diego. Gabriel’s research focuses on the epidemiology of infectious diseases and the intersection with environmental determinants. Currently he is leading two data management teams of random controlled trials (RCTs) on Covid-19 treatments and vaccines in Peru.


Dr Partha Kar

Dr Partha Kar is a Consultant and National Specialty Advisor, Diabetes, NHS UK. Partha is part of the national team that undertook the data analysis around Covid-19, which subsequently contributed to vaccine prioritisation via JCVI, as well as risk tools such as Q-COVID risk tool developed by Oxford. Partha has also helped in developing information portals and language specific videos to help increase uptake of Covid-19 vaccines, by working with colleagues across the UK.

Partha is involved in diabetes care, and championing technology access in diabetes (Libre, CGM in Type 1 Diabetes). He has led work on interactions between HCPs and patients (“Language Matters”),  pioneered online self-management programmes for diabetes, as well as being co-creator of TAD (Talking About Diabetes) and Type 1 Diabetes comic (Volume 1, 2 and 3). Partha is an avid user of social media to engage with patients and was recognised as a “Social media Pioneer” by HSJ in 2014.  He also writes a monthly blog for the BMJ, has a personal blog (“Sugar and Spice: Wish all things were nice”) and a podcast (“Sweet Talking”). Partha was recently awarded an OBE for “services to Diabetes care”.

A huge fan of movies and an avid reader of comic books, Partha’s favourite food is Biriyani, but generally any good food, with a partiality towards Vietnamese too! He speaks English, Bengali and Hindi. Loves cricket and holidays where you do nothing.


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.


Shamaila Anwar

Shamalia is currently project managing the National Institute of Health Research ‘COVID and Me’ programme to address inclusivity in vaccine research and reaching underserved communities.

Dr Shamaila Anwar is a senior manager at the National Institute for Health Research where she has worked for the last 6 years managing key initiatives in Cancer, Surgery and Oral and Dental Health Research.

Shamaila completed her PhD in epidemiology at the University of Bradford and has a background in the development and management of clinical trials across a number of different specialty areas.  


Dr Monica Peres Oikeh

Dr Monica Peres Oikeh, is A General Practitioner currently working in cork, Republic of Ireland. She is a graduate of trinity college Dublin.  As a GP,  she looks after patients of all ages and genders. She is passionate about health promotion and uses social media- Tiktok and Instagram to deliver health tips.  She believes now more than ever, people should be able to access credible sources of information regarding their health. She is also working with the Department of Health in the Republic of Ireland to facilitate this and is one of the doctors administering the Covid19 vaccines in vaccination hub.

Monica is Nigerian Irish. Pre-pandemic her favourite thing to do was to hop on the plane and explore a new country ( 5 continents and counting), but she has recently got a lovely dog called Maya and now loves to spend time with her instead. She also loves cooking, learning new languages and spending time with family.


Professor Shiv Pillai

Shiv is Professor of Medicine and Health Sciences & Technology at Harvard Medical School where he’s Director of the immunology postgraduate programmes, and a Group leader at the Ragon Institute of MGH, MIT and Harvard, where his lab is located. He is a world leader in the study of fundamental B-cell development. Currently his lab is studying the immune response to Covid-19, where they have identified a potential way in which the disease’s cytokine storm may inhibit development of a strong antibody response by the immune system.



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Melvin George


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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 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.