Gill ten Hoor is assistant professor at the Faculty of Psychology and Neuroscience (FPN), Maastricht University, and adjunct instructor at the University of Texas Health Science Center at Houston. Gill has an MSc in biology (Sports and Physical Activity Interventions), an MSc in Psychology, (Health & Social Psychology), and a PhD in Behavioural science. In his training and research, Gill has actively sought to combine biological and psychological insights, especially developing interdisciplinary approaches to the prevention of obesity in youth. Within this research line, there is a specific focus on physical activity, sedentary behaviour, and body composition. Next to this, Gill is certified Intervention Mapping trainer and contributes to planned behaviour change in various topics (e.g. waste separation and Chlamydia testing), as well as behaviour change methods (e.g. threatening messages and implementation intentions). One landmark publication is the introduction of “Implementation Mapping”, a protocol for applying Intervention Mapping (using insights from Implementation Science) to develop implementation strategies (Fernandez, ten Hoor, et al., 2019). In his entire career, Gill strives for openness and transparency in science: his publications, including his entire PhD dissertation, are open-access, and all data, syntax, and output are available to guarantee scientific integrity. Gill is an active EHPS-member since 2013, Dutch National delegate since 2018, co-founder of Practical Health Psychology (www.practicalhealthpsychology.com), executive editor for Health Psychology Bulletin and reviewer for EHPS journals. In 2018, he received the Herman Schaalma Award.