Enactive, embodied, and ecological approaches to psychology and cognitive science; the psychology of places (behaviour settings); scientific practice in psychology; the research-practice gap in education.

Marek has been a lecturer in the Department of Psychology since 2005. His principal research is theoretical work on the enactive approach to cognitive science, which examines the mind more as something we do rather than something we have. This is also related to ecological approaches to psychology, which explore how behaviour and mental life can be examined by looking at what your head is in, rather than what is in your head. He also has a related interest in critical considerations of theory and scientific practice in psychology more broadly.

Marek co-convenes the ENSO Seminars, a series of online seminars with researchers from enactive and ecological cognitive science.

In recent years, Marek has played a founding role in the development of of T-REX, the Teachers' Research Exchange. T-REX is an online community of practice for education research in Ireland. It aims to support improved practice in education research by enabling better communication and integration between academic education research and professional practice in classrooms.

Marek also has an interest in active learning, and is a member of the steering group for FACiLiTATE, the Irish network for enquiry/problem-based learning in higher education.