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Alex Walker

University of Oxford

United Kingdom

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Research Interests

Epidemiology

90%

Health Economics

20%

Covid-19

70%

Pandemic Studies

40%

Case-control Study

30%

Vaccine Development

20%

Pharmacoepidemiology

20%

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Recent Grants

Grant: Close

Data Science to inform NHS compound winter pressure policy response

Open Date: 2023-01-01

Close Date: 2023-03-01

Grant: Close

What are the patterns of healthcare use in children and young people with SARS-CoV-2 in the 12 months following infection?

Open Date: 2021-10-01

Close Date: 2022-09-01

Grant: Close

Urgent research and surveillance on Covid-19 using the new OpenSAFELY secure platform across 55 million patients' full linked primary care records

Open Date: 2020-05-28

Close Date: 2021-11-28

Grant: Close

Creating and validating a tool for identifying and addressing unwarranted variation in GP prescribing behaviour

Open Date: 2020-02-28

Close Date: 2022-03-31

Grant: Close

The causes of constipation. Reclassifying constipation using MRI and high resolution manometry to define mechanism of disease and target treatment.

Open Date: 2016-06-30

Close Date: 2020-09-29

Articles18

The relationship between general practice characteristics, case-mix, and secondary care attendances/admissions before and after the COVID-19 pandemic: Protocol for an OpenSAFELY cohort study

Article Link

Year:

2025

Variation in duration of repeat prescriptions: a primary care cohort study in England

Article Link

Year:

2025

Patient characteristics associated with clinically coded long COVID: an OpenSAFELY study using electronic health records

Article Link

Year:

2025

Vitamin B12 prescribing from 2015 to 2024 in English general practice: an observational study to investigate the switch from injections to tablets

Article Link

Year:

2025

Impact of vaccination on the association of COVID-19 with cardiovascular diseases

Article Link

Year:

2024

The impact of COVID-19 on medication reviews in English primary care. An OpenSAFELY-TPP analysis of 20 million adult electronic health records.

Article Link

Year:

2024

Data-Driven Identification of Potentially Successful Intervention Implementations Using 5 Years of Opioid Prescribing Data: Retrospective Database Study

Article Link

Year:

2024

Study protocol: Comparison of different risk prediction modelling approaches for COVID-19 related death using the OpenSAFELY platform

Article Link

Year:

2024

Changes in medication safety indicators in England throughout the covid-19 pandemic using OpenSAFELY: population based, retrospective cohort study of 57 million patients using federated analytics

Article Link

Year:

2023

OpenSAFELY NHS Service Restoration Observatory 2: changes in primary care clinical activity in England during the COVID-19 pandemic

Article Link

Year:

2023

Challenges in estimating the effectiveness of COVID-19 vaccination using observational data

Article Link

Year:

2023

Data-Driven Identification of Unusual Prescribing Behavior: Analysis and Use of an Interactive Data Tool Using 6 Months of Primary Care Data From 6500 Practices in England

Article Link

Year:

2023

Association between living with children, vaccination, and outcomes from COVID-19: an OpenSAFELY cohort study of 12 million adults in England during 2021–22

Article Link

Year:

2023

Ethnic differences in the indirect effects of the COVID-19 pandemic on clinical monitoring and hospitalisations for non-COVID conditions in England: a population-based, observational cohort study using the OpenSAFELY platform.

Article Link

Year:

2023

Waning effectiveness of BNT162b2 and ChAdOx1 covid-19 vaccines over six months since second dose

Article Link

Year:

2022

Identifying Patterns of Clinical Interest in Clinicians’ Treatment Preferences: Hypothesis-free Data Science Approach to Prioritizing Prescribing Outliers for Clinical Review

Article Link

Year:

2022

Comparative effectiveness of ChAdOx1 versus BNT162b2 covid-19 vaccines in health and social care workers in England: cohort study using OpenSAFELY

Article Link

Year:

2022

Studying the Long-term Impact of COVID-19 in Kids (SLICK). Healthcare use and costs in children and young people following community-acquired SARS-CoV-2 infection: protocol for an observational study using linked primary and secondary routinely collected healthcare data from England, Scotland and Wales

Article Link

Year:

2022

Collaborators33

Jonathan Sterne

University of Bristol

UNITED KINGDOM

Andrew Brown

University of Oxford

UNITED KINGDOM

Yinghui Wei

Associate Professor of Statistics

University of Plymouth

UNITED KINGDOM

James Farrell

University of Edinburgh

UNITED KINGDOM

Elsie Horne

University of Bristol

UNITED KINGDOM

Thomas E Cowling

Assistant Professor

London School of Hygiene & Tropical Medicine

UNITED KINGDOM

Christine Cunningham

University of Oxford

UNITED KINGDOM

Brian D. Nicholson

University of Oxford

UNITED KINGDOM

Apostolos Tsiachristas

University of Oxford

UNITED KINGDOM

Laurie Tomlinson

Lecturer

London School of Hygiene & Tropical Medicine

UNITED KINGDOM

Elizabeth Williamson

Professor of Biostatistics and Health Data Science

London School of Hygiene & Tropical Medicine

UNITED KINGDOM

Helen Curtis

University of Oxford

UNITED KINGDOM

Venexia Walker

Academic , Senior Lecturer

University of Bristol

UNITED KINGDOM

Louis Fisher

University of Oxford

UNITED KINGDOM

Sarah Rodgers

Head of Research Services

University of Nottingham

UNITED KINGDOM

Orla Macdonald

University of Oxford

UNITED KINGDOM

Krishnan Bhaskaran

Professor of Statistical Epidemiology

London School of Hygiene & Tropical Medicine

UNITED KINGDOM

Harriet Forbes

University of Bristol

UNITED KINGDOM

Marwa Al Arab

University of Bristol

UNITED KINGDOM

Kathryn Mansfield

Associate Professor

London School of Hygiene & Tropical Medicine

UNITED KINGDOM

Christopher Rentsch

Adjunct Assistant Professor

Yale University School of Medicine

UNITED STATES

Andrea Schaffer

University of Oxford

UNITED KINGDOM

Sebastian Bacon

University of Oxford

UNITED KINGDOM

Colm Andrews

University of Oxford

UNITED KINGDOM

Ben Goldacre

University of Oxford

UNITED KINGDOM

Peter Inglesby

University of Oxford

UNITED KINGDOM

Olivia Swann

Clinical Lecturer in Paediatric Infectious Diseases

University of Edinburgh

UNITED KINGDOM

Brian MacKenna

University of Oxford

UNITED KINGDOM

Tom Palmer

University of Bristol

UNITED KINGDOM

Anand Ahankari

Lecturer in Maternal, Child and Family Health

University of Surrey

UNITED KINGDOM

Helen McDonald

University of Bath

UNITED KINGDOM

Agnieszka Lemanska

Lecturer

University of Surrey

UNITED KINGDOM

Rochelle Knight

University of Bristol

UNITED KINGDOM

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