The two organizers of this Special Session Round Table are guest editors, and the eight discussants are the authors of the Journal of Sport Psychology in Action Special Issue (JSPA SI) entitled “Working with sport clients in transitions” (in progress). The participants, both males and females, represent nine countries, and have diverse educational, research, and applied sport psychology experiences. The Round Table is aimed at discussing intervention case studies authored by the discussants from the scientist-practitioner perspective to further promote this perspective in the transition-related interventions. Schinke et al. (2024) defined a scientist-practitioner as someone who is trained as both scientist and practitioner; consume, evaluate, and apply up-to-date theoretical and empirical advancements; possess investigation and intervention competences; have a scientific viewpoint and research orientation in practice; reflect on and bridge the science and professional practice, for example, by publishing and disseminate practice-based ideas and evidence. The organizers will begin with a short introduction to the JSPA SI, and the scientist-practitioner definition (6 min.) Then, the discussants will briefly present themselves and their cases outlining the client, context, theoretical/research ground, content, and outcomes of their interventions (8 min. each) The cases to be presented deal with diverse clients (e.g., athletes, coaches), in different transitions (e.g., athletic retirement, injury, COVID-19 pandemic) and grounded in various frameworks (e.g., the meta-model of adaptation in sport by Samuel et al., 2023; the transition environment models by Henriksen et al., 2023). In the conclusive part (20 min.) two questions will be suggested for general discussion: (a) how the scientist-practitioner perspective can be further promoted in transition interventions? (b) how sport psychology evidence-based experiences of working with clients in transitions might be useful in assisting other groups of performers (e.g., in arts, army, police)? Engagement from the audience will be encouraged, and the discussants’ collective wisdom summarized.