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Dr George Thomas
Dr

George Thomas

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Overview

Background

Dr George Thomas is a Research Fellow in the School of Human Movement and Nutrition Sciences at The University of Queensland and a member of the ARC Centre of Excellence for the Digital Child. His research focuses on children’s digital technology use, family digital routines, healthy screen use, and child health and wellbeing.

George leads an integrated program of research focused on understanding and improving how families manage children’s screen use. His work spans digital health, behavioural science, public health, and research translation through partnerships with government and industry.

His research has informed international policy and guidelines, including reports from UNESCO and the World Health Organization, and contributes to global initiatives such as the Active Healthy Kids Global Alliance.

George is also committed to education and mentorship, having supervised more than 40 student research projects across psychology, dietetics, and exercise science, and supporting students to work on real-world policy and community initiatives.

Availability

Dr George Thomas is:
Available for supervision
Media expert

Qualifications

  • Bachelor (Honours) of Exercise and Sports Sciences, University of Gloucestershire
  • Masters (Research) of Health Sciences (Public Health), University of Bristol
  • Doctor of Philosophy of Behavioural Science, University of Southern Queensland

Research interests

  • Physical activity and health

  • Measurement of physical activity and sedentary behaviour

  • Screen use in children and adolescents

  • Pragmatic evaluation of health promotion interventions

Research impacts

Dr Thomas's research is helping shape healthier digital habits, improve child wellbeing, and support families, schools, and communities to navigate the challenges of growing up in a digital world.

Key impacts include:

Informing policy and global guidelines

George’s research has informed more than 40 policy documents from international and national organisations, including UNESCO and the World Health Organization, contributing to global discussions on children’s digital wellbeing and health.

Improving how children’s screen use is measured and understood

His research has helped shift the field beyond simple “screen time” measures toward understanding family digital routines, influencing how researchers, governments, and organisations approach children’s digital behaviour and health.

High research influence and uptake

With more than 30 publications, over 1,300 citations, and a Field-Weighted Citation Impact of 5.16 (cited 416% more than the global average), George’s research is widely used by researchers, policymakers, and organisations worldwide. His work has been cited across more than 100 countries and multiple disciplines including medicine, psychology, engineering, and social sciences.

Translation into real-world programs and workforce development

George works closely with Health and Wellbeing Queensland to translate research into practice, including contributing to preventive health training programs reaching more than 4,500 Child and Family Health staff across Queensland who support families with young children.

Leadership of funded research addressing real-world problems

He has secured more than $2.5 million in competitive research funding and leads projects focused on improving children’s digital wellbeing, family health behaviours, and community health programs.

Works

Search Professor George Thomas’s works on UQ eSpace

65 works between 2018 and 2026

21 - 40 of 65 works

2025

Journal Article

Association between 24-h movement behaviors and mental health in children and adolescents: a systematic review and compositional data meta-analysis

Bourke, Matthew, Wang, Hiu Fei Wendy, Fortnum, Kathryn, Thomas, George, O'Flaherty, Martin, Mulcahy, Samantha K., Gomersall, Sjaan R., Alsop, Tahlia, Trost, Stewart G., Bruijns, Brianne A., Phillips, Sophie M., Vanderloo, Leigh, Tucker, Patricia, Hesketh, Kylie D., Kwan, Matthew Y. W. and Cairney, John (2025). Association between 24-h movement behaviors and mental health in children and adolescents: a systematic review and compositional data meta-analysis. Scandinavian Journal of Medicine and Science in Sports, 35 (8) e70120, 1-18. doi: 10.1111/sms.70120

Association between 24-h movement behaviors and mental health in children and adolescents: a systematic review and compositional data meta-analysis

2025

Other Outputs

Promoting mental wellbeing and recovery across the lifespan: a review of evidence

Fortnum, Kathryn, Bourke, Matthew, Thomas, George, Mulcahy, Samantha, Alsop, Tahlia and Gomersall, Sjaan (2025). Promoting mental wellbeing and recovery across the lifespan: a review of evidence. doi: 10.31219/osf.io/y7uwj_v1

Promoting mental wellbeing and recovery across the lifespan: a review of evidence

2025

Journal Article

Development, validation, acceptability and usability of a device-based system to measure sit-stand desk usage

Healy, Genevieve N., Melendez-Calderon, Alejandro, Kaab, Sami, Bongers, Noah, Heseltine, Katherine A., Yue, Chan Hi, Thomas, George and Clark, Bronwyn K. (2025). Development, validation, acceptability and usability of a device-based system to measure sit-stand desk usage. Applied Ergonomics, 126 104490, 104490. doi: 10.1016/j.apergo.2025.104490

Development, validation, acceptability and usability of a device-based system to measure sit-stand desk usage

2025

Conference Publication

Do barriers, enablers, and support needs for screen use management differ by presence of siblings among Australian parents of young children?

Thomas, George, Duncombe, Stephanie, Gomersall, Sjaan, Morawska, Alina, Vergeer, Ineke and Biddle, Stuart (2025). Do barriers, enablers, and support needs for screen use management differ by presence of siblings among Australian parents of young children?. International Society of Behavioural Nutrition and Physical Activity, Auckland, New Zealand, 11-14 June 2025.

Do barriers, enablers, and support needs for screen use management differ by presence of siblings among Australian parents of young children?

2025

Conference Publication

Bridging the gap between research and practice through government and academic partnerships: opportunities, challenges and lessons learned from Australia and New Zealand

Thomas, George, Mulchay, Samantha, Gomersall, Sjaan, Richards, Justin and Andrews, Lara (2025). Bridging the gap between research and practice through government and academic partnerships: opportunities, challenges and lessons learned from Australia and New Zealand. International Society of Behavioural Nutrition and Physical Activity, Auckland, New Zealand, 11-14 June 2025.

Bridging the gap between research and practice through government and academic partnerships: opportunities, challenges and lessons learned from Australia and New Zealand

2025

Journal Article

Clusters of healthy lifestyle behaviours are associated with symptoms of depression, anxiety, and psychological distress: a systematic review and meta-analysis of observational studies

Bourke, Matthew, Wang, Hiu Fei Wendy, McNaughton, Sarah A., Thomas, George, Firth, Joseph, Trott, Mike and Cairney, John (2025). Clusters of healthy lifestyle behaviours are associated with symptoms of depression, anxiety, and psychological distress: a systematic review and meta-analysis of observational studies. Clinical Psychology Review, 118 102585, 102585. doi: 10.1016/j.cpr.2025.102585

Clusters of healthy lifestyle behaviours are associated with symptoms of depression, anxiety, and psychological distress: a systematic review and meta-analysis of observational studies

2025

Journal Article

Association between 24-hour movement behaviors and adiposity in children and adolescents: A compositional data meta-analysis

Bourke, Matthew, Harrison, Zoe, Fortnum, Kathryn, Thomas, George, O'Flaherty, Martin, Mulcahy, Samantha K., Gomersall, Sjaan R., Alsop, Tahlia, Trost, Stewart G., Koplin, Jennifer J., Bruijns, Brianne A., Phillips, Sophie M., Vanderloo, Leigh M., Tucker, Patricia, Hesketh, Kylie D., Kwan, Matthew Y. W. and Cairney, John (2025). Association between 24-hour movement behaviors and adiposity in children and adolescents: A compositional data meta-analysis. Obesity Reviews, 26 (5) e13884, 1-15. doi: 10.1111/obr.13884

Association between 24-hour movement behaviors and adiposity in children and adolescents: A compositional data meta-analysis

2025

Journal Article

How physical activity context relates to cognition across the lifespan: a systematic review and meta-analysis

Mavilidi, Myrto F., Vazou, Spyridoula, Lubans, David R., Robinson, Katie, Woods, Andrew J., Benzing, Valentin, Anzeneder, Sofia, Owen, Katherine B., Álvarez-Bueno, Celia, Wade, Levi, Burley, Jade, Thomas, George, Okely, Anthony D. and Pesce, Caterina (2025). How physical activity context relates to cognition across the lifespan: a systematic review and meta-analysis. Psychological Bulletin, 151 (5), 544-579. doi: 10.1037/bul0000478

How physical activity context relates to cognition across the lifespan: a systematic review and meta-analysis

2025

Journal Article

Unpacking the relationship between autism, sport participation, and adolescent health: a causal mediation analysis

O'Flaherty, Martin, Hill, Jessica, Bourke, Matthew, Fortnum, Kathryn, Thomas, George, Gomersall, Sjaan R. and Cairney, John (2025). Unpacking the relationship between autism, sport participation, and adolescent health: a causal mediation analysis. Disability and Health Journal, 18 (3) 101832, 1-8. doi: 10.1016/j.dhjo.2025.101832

Unpacking the relationship between autism, sport participation, and adolescent health: a causal mediation analysis

2025

Journal Article

Construct validity and reliability of the effective early childhood physical literacy pedagogue (ECE-PLP) self-report instrument

Barratt, Jaime, Dudley, Dean, Stylianou, Michalis, Thomas, George, Wheeler, Kai and Cairney, John (2025). Construct validity and reliability of the effective early childhood physical literacy pedagogue (ECE-PLP) self-report instrument. Measurement in Physical Education and Exercise Science, 29 (2), 145-159. doi: 10.1080/1091367x.2024.2422309

Construct validity and reliability of the effective early childhood physical literacy pedagogue (ECE-PLP) self-report instrument

2024

Conference Publication

Exploring Australian parents’ perceptions of young children’s screen use

Thomas, George, Vergeer, Ineke, Rowland, Deborah, Kolbe-Alexander, Tracy, Krishnamoorthy, Govind, March, Sonja, Gomersall, Sjaan and Biddle, Stuart (2024). Exploring Australian parents’ perceptions of young children’s screen use. International Society for Physical Activity and Health, Paris, France, 28-31 October 2024.

Exploring Australian parents’ perceptions of young children’s screen use

2024

Conference Publication

Better methods to provide stronger evidence on health implications of screen use by children

Beynon, Amber, Hendry, Danica, Rasmussen, Charlotte, Rohl, Andrew, Eynon, Rebecca, Thomas, George, Stearne, Sarah, Campbell, Amita, Harris, Courtney, Zabatiero, Julianna and Straker, Leon (2024). Better methods to provide stronger evidence on health implications of screen use by children. International Society for Physical Activity and Health, Paris, France, 28-31 October 2024.

Better methods to provide stronger evidence on health implications of screen use by children

2024

Conference Publication

Everyday environmental light exposures in children

Pattinson, C. L., Thomas, G., Mann, D. L., MacKenzie, J., Rossa, K. R., Edmed, S. L., Westwood, E. and Smith, S. S. (2024). Everyday environmental light exposures in children. 10th International Society for Physical Activity and Health Congress, Paris, France, 28-31 October 2024.

Everyday environmental light exposures in children

2024

Conference Publication

Does sports participation attenuate the relationship between screen time and quality of life of children?

Khan, Asad, Thomas, George and Cairney, John (2024). Does sports participation attenuate the relationship between screen time and quality of life of children?. International Society for Physical Activity and Health, Paris, France, 28-31 October 2024.

Does sports participation attenuate the relationship between screen time and quality of life of children?

2024

Conference Publication

Meta-analysis of association between 24-hour movement behaviours and social-emotional and cognitive outcomes in youth

Bourke, Matthew, Thomas, George, Fortnum, Kathryn, O'Flaherty, Martin and Gomersall, Sjaan (2024). Meta-analysis of association between 24-hour movement behaviours and social-emotional and cognitive outcomes in youth. International Society for Physical Activity and Health, Paris, France, 28-31 October 2024.

Meta-analysis of association between 24-hour movement behaviours and social-emotional and cognitive outcomes in youth

2024

Conference Publication

Evaluation of the Motus wearable-sensor-based system to classify postures and movements in 3-14 aged children

Rasmussen, Charlotte, Hendry, Danica, Thomas, George, Beynon, Amber, Stearne, Sarah, Zabatiero, Julianna, Davey, Paul, Rohl, Andrew, Straker, Leon and Campbell, Amity (2024). Evaluation of the Motus wearable-sensor-based system to classify postures and movements in 3-14 aged children. International Society for Physical Activity and Health, Paris, France, 28-31 October 2024.

Evaluation of the Motus wearable-sensor-based system to classify postures and movements in 3-14 aged children

2024

Conference Publication

Associations of early childhood screen use contexts with cognitive and psychosocial outcomes: A systematic review and meta-analysis

Mallawaarachichi, Sumudu, Burley, Jade, Mavilidi, Myrto, Howard, Steven, Straker, Leon, Kervin, Lisa, Staton, Sally, Hayes, Nicola, Machell, Amanda, Torjinski, Marina, Brady, Brodie, Thomas, George, Horwood, Sharon, White, Sonia, Zabatiero, Julianna, Rivera, Clara and Cliff, Dylan (2024). Associations of early childhood screen use contexts with cognitive and psychosocial outcomes: A systematic review and meta-analysis. International Society for Physical Activity and Health, Paris, France, 28-31 October 2024.

Associations of early childhood screen use contexts with cognitive and psychosocial outcomes: A systematic review and meta-analysis

2024

Journal Article

Evaluation of the ActiMotus software to accurately classify postures and movements in children aged 3–14

Lund Rasmussen, Charlotte, Hendry, Danica, Thomas, George, Beynon, Amber, Stearne, Sarah Michelle, Zabatiero, Juliana, Davey, Paul, Roslyng Larsen, Jon, Rohl, Andrew Lloyd, Straker, Leon and Campbell, Amity (2024). Evaluation of the ActiMotus software to accurately classify postures and movements in children aged 3–14. Sensors, 24 (20) 6705, 6705. doi: 10.3390/s24206705

Evaluation of the ActiMotus software to accurately classify postures and movements in children aged 3–14

2024

Journal Article

24-hour movement behaviors of LGBTQA+ young people: a systematic review

Fortnum, Kathryn, Gomersall, Sjaan R., Ross, Megan H., Woodforde, James, Thomas, George, Wen, Yu-Shu, Perales, Francisco and Stylianou, Michalis (2024). 24-hour movement behaviors of LGBTQA+ young people: a systematic review. Journal of Physical Activity & Health, 21 (12), 1-17. doi: 10.1123/jpah.2024-0343

24-hour movement behaviors of LGBTQA+ young people: a systematic review

2024

Journal Article

Developing best practice guidance for educational psychologists gaining consent across the 0-25 age range

Lyons, Althea, Thomas, George, Octigan, Sean and Orme, Joe (2024). Developing best practice guidance for educational psychologists gaining consent across the 0-25 age range. Educational Psychology in Practice, 40 (4), 472-490. doi: 10.1080/02667363.2024.2403072

Developing best practice guidance for educational psychologists gaining consent across the 0-25 age range

Funding

Current funding

  • 2026 - 2030
    The Screen Use Taxonomy: a new framework for investigating the harms and benefits of screen time among children and adolescents
    NHMRC IDEAS Grants
    Open grant

Past funding

  • 2023 - 2024
    Creativity in Motion: Fostering athletes' creative potential and adaptability
    Tennis Australia
    Open grant

Supervision

Availability

Dr George Thomas is:
Available for supervision

Looking for a supervisor? Read our advice on how to choose a supervisor.

Available projects

  • Health and Wellbeing Centre for Research Innovation

    We currently have opportunities available for multiple higher degree research (HDR) students to join the Health and Wellbeing Centre for Research Innovation (HWCRI). In 2022, UQ received foundation funding from Health and Wellbeing Queensland (HWQld) to co-fund the creation of the Health and Wellbeing Centre for Research Innovation (HWCRI). In partnership with HWQld, HWCRI provides clinical and research expertise in in the fields of physical activity and nutrition with a population and preventative health focus, to inform HWQld’s program design, delivery and evaluation. HWCRI conducts innovative and novel high impact transdisciplinary research in community health and wellbeing across the lifecourse, to reduce health inequities and improve the health and wellbeing of all Queenslanders. The UQ HWCRI aims to translate research and evaluation findings into concepts and products for population level, state-wide implementation; and to build and sustain capacity in health promotion expertise by providing ‘real world’ training opportunities for undergraduate, post-graduate and higher degree research (HDR) students and fellows.

    Successful applicants will be part of the School of Human Movement and Nutrition Sciences which is consistently ranked in the world’s Top 5 and is highly regarded nationally and internationally for its teaching, research and community outreach programs. The 2021 QS World Rankings by subject area ranked UQ first in Australia and second in the world in sports-related subjects. They will also be supported and conduct research in partnership with Health and Wellbeing Queensland (HWQld) which is a Queensland Government prevention agency aimed at improving population health and reducing health inequities by reducing the burden of chronic disease across the state. The health and wellbeing of the next generation of Queensland children is a key focus for HWQld and offers a once in a life-time opportunity to change the lives of the next generation where every Queenslander can live their best life, regardless of where they live.

    This opportunity would suit students with a background in allied health, health promotion, public health, health psychology, implementation science, or human movement studies. Excellent communication and interpersonal skills are essential. Experience working with industry stakeholders and knowledge of qualitative and quantitative research methods and behaviour change would be of benefit. First Nations applicants are particularly encouraged to apply. This is a unique opportunity to be at the forefront of this exciting new research centre and engage with industry partners and government and specific programs of research can be tailored based on the applicant’s interest and previous experience and expertise.

Supervision history

Current supervision

Media

Enquiries

Contact Dr George Thomas directly for media enquiries about:

  • Adolescents
  • Children
  • Physical activity
  • Screen use
  • Sedentary behaviour

Need help?

For help with finding experts, story ideas and media enquiries, contact our Media team:

communications@uq.edu.au