Professor Gabrielle Zammit is a principal investigator in the fields of phycology and microbiology.

She was the first microbiologist to study microbial communities growing as biofilms and microbial mats in different habitats around Malta, and has published a number of scientific papers on this theme. Her research is multidisciplinary, combining a wide array of complementary scientific techniques to study novel microbial and microalgal biodiversity, microbial interaction with the environment, as well as the microbial deterioration of a variety of substrates.

Gabrielle is the only biologist who has published new genera and species of Maltese microorganisms in specialised journals to date. She has isolated in culture a number of new strains of bacteria and algae, many of which are new to science. Her current research deals with their description via integrative systematics and the extraction of new bioactive substances for downstream bioprocessing and prospective industrial application.

For the past fifteen years, Gabrielle has shared her knowledge and skills with students enrolled in various undergraduate and postgraduate degrees, in Malta and abroad. She is presently an Associate Professor at the University of Malta's Faculty of Science, where she leads the Microbiology and Applied Phycology Labs. She is an associate member of the Centre for Molecular Medicine and Biobanking and a fellow of the Royal Society of Biology (UK). She is also a member of various international scientific bodies, and an invited editor and reviewer of scientific journals in her areas of expertise.