Osmar Luiz is an aquatic ecologist who has undertaken projects in marine and freshwater environments both in Brazil and Australia. Much of his research is devoted to understanding relationships between fish assemblages and their environments using quantitative trait-based approaches. Osmar has a PhD from Macquarie University, in Sydney (completed 2014), and a Masters degree in Ecology from Campinas State University (UNICAMP), in Brazil. Osmar has published over 30 peer-reviewed scientific articles about fish ecology and marine conservation. Osmar joined the Aquatic Ecology & Management group at RIEL in 2017 to study the distribution of fish traits and their influence on fish communities’ resilience to environmental change in rivers of northern Australia. Secondary to his research activities, he is also active in scientific outreach. As scuba dive instructor and underwater photographer, he enjoys giving marine biology seminars and writing magazine articles devoted to a non-scholarly audience. Additionally, he has been involved in management of dive tourism within Brazilian marine protected areas.