Chelsea Rochman – Assistant Professor


I am currently on the faculty in the Department of Ecology and Evolutionary Biology at University of Toronto.

Previously, I was a David H. Smith Postdoctoral Fellow at the Aquatic Health Program at the University of California, Davis. I received my PhD in a joint program with San Diego State University and UC Davis in Ecology and was advised primarily by Swee Teh and Eunha Hoh. For more about me, please download my CV.

Current Lab Members:

Keenan Munno – Lab Manager & Research Assistant


Keenan is a recent M.Sc. Ecology graduate from the University of Toronto with a particular interest in the fate and effects of microplastics in fish. Her work focused on method development, as well as microplastic ingestion and retention in freshwater fish from the Great Lakes. She obtained her undergraduate degree from Queen’s University in Biology, with a thesis in freshwater oil spill toxicology. She is continuing to pursue her interests in identifying and quantifying microplastics through her work as a Research Associate and Lab Manager in the Rochman lab.

Clara Thaysen – MSc Student


Clara was an undergraduate student in our lab who majored in Ecology and Evolutionary Biology and Earth Sciences. She is now a MSc student researching the fate of microplastics in aquatic food webs. Her past research in our lab has investigated the potential leaching and toxicity of styrenes and other volatile chemicals from food packaging into food products. This project was in collaboration with 5 Gyres and MOECC. Clara is also continuing and finishing a project investigating plastic ingestion in seagulls and examining the fate of flame retardants to and from plastic debris in the gulls. This project is in collaboration with Miriam Diamond and Jonathan Verreault.

Joel Kim – MSc Student


Joel has an interest in anthropogenic contaminants, their effects on freshwater ecosystems, and revolving consequences to humans. In the Rochman Lab, his research involves looking at microplastics and associated chemical contaminants in freshwater fish caught for human consumption. This research is in collaboration with Paul Helm, Tim Ksrul, and Satyendra Bhavsar at the Ministry of the Environment and Climate Change.

Nicholas Tsui – MSc Student at UTM

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Nicholas is a student from the Sustainability Management graduate program who has a strong interest in understanding the industry contribution towards microplastic pollution. His work at the Rochman Lab collaborates with the Ministry of Environment, Conservation, and Parks and the Canadian Plastics Industry Association to develop a sampling program that monitors plastic effluents and strategize with local industry partners to reduce their emissions.

Alice (Xia) Zhu – PhD Student

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Alice (Xia) Zhu is a PhD student in the Rochman Lab studying the fate of plastic pollution in the marine environment. Alice is working in collaboration with researchers at CSIRO’s Marine and Atmospheric Research flagship and scientists at Acadia University to quantify plastic masses in global marine reservoirs. Alice will also be determining the transport mechanisms of plastic pollution throughout the ocean using a combination of field campaigns and oceanographic modelling in collaboration with various partners in research institutions and academia. Alice is excited about all things environmental and food-related.

Rachel Giles – PhD Student

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Rachel uses field and laboratory approaches to understand how mixtures of anthropogenic contaminants impact wildlife in urban streams in two urban areas: the Greater Toronto Area and Northern Vietnam. She collaborates locally with the Toronto and Region Conservation Authority, Environment and Climate Change Canada, and the Sinton Lab to understand how benthic macroinvertebrate communities respond to salt-laden urban runoff during the winter months. Internationally, she collaborates with Ocean Conservancy (US) and The Center for Marinelife Conservation and Community Development (Vietnam) to investigate how litter and inorganic contaminants impact invertebrate communities. This multi-stressor, community-focused approach complements current research that recognizes the aforementioned contaminants that have harmful ecological effects.

Kennedy Bucci – PhD Student

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Kennedy’s research focusses on the biological and ecological effects of microplastic pollution in freshwater environments. She is currently collaborating with the Ministry of Environment, Conservation and Parks (MECP), studying the chemical and physical effects of various microplastics on freshwater fish. Her research goals include investigating the ecosystem-level effects of microplastic pollution using experimental mesocosms.

Lisa Erdle – PhD Candidate

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Lisa researches the effects of microplastics on animals that are part of a Great Lakes food web. In her work, Lisa collaborates with the Ministry of the Environment, Conservation and Parks (MECP) as well as Environment and Climate Change Canada (ECCC) to better understand how microfibers – one of the most common types of microplastics – impact fish and invertebrates through physical and chemical processes.

Bonnie Hamilton – PhD Student

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Bonnie received her B.S. with honors in Environmental Health Science from Alma College (Michigan). She is currently a PhD student researching the ecotoxicity of microplastics and their relationship with other anthropogenic stressors in Arctic ecosystems. Her work is in collaboration with local communities, Environment and Climate Change Canada and NGOs.  Additionally, she is working with the Monterey Bay Aquarium Research Institute on a collaborative project evaluating the movement of microplastic and chemical pollutants in the Monterey Bay pelagic food web.

Samantha Athey – PhD Student (Rochman and Diamond Group)

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Sam received her B.S. with honors and M.Sc. in Marine Science from the University of North Carolina Wilmington, where she conducted research on microplastic ingestion in marine species. She is currently completing her Ph.D. at the University of Toronto, studying microfiber and chemical loss from clothing in the context of Great Lake ecosystems. ​Learn more about microfiber pollution and her research through Sam’s website and blog.

Lingyun Li – Visiting PhD Student

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Lingyun is a visiting student in the Rochman Lab. She comes from East China Normal University as a PhD student working with Huahong Shi. Lingyun focuses on the unique physical and chemical properties of microplastics and the effects of various microplastics on fish and shellfish in laboratory experiments under environmentally relevant exposure scenarios.

Dr. Ludovic Hermabessiere


Ludovic recently received his PhD from the University of Littoral Côte d’Opale (France). His PhD focused on developing methods to study microplastics and their plastic additives in seafood products. Here at UofT, Ludovic will work in collaboration with the Drinking Research Water Group and the Ministry of Environment to develop Pyrolysis-GC/MS and Raman methods to analyze microplastics in drinking water and other matrices.

Dr. Stephanie Borrelle – David H. Smith Postdoctoral Fellow


Stephanie is a conservation ecologist from Aotearoa New Zealand. Her PhD was on the impact of marine threats (plastic, climate, fisheries) to the world’s highly threatened seabirds. Her passion for seabirds, which are disproportionately affected by marine plastic, led her to research focussed on effective solutions to this intensifying issue. In our lab, Stephanie is working to quantify the impacts of intervention strategies (e.g. single-use plastic bans, container deposit schemes, clean-ups, plastic cap & trade…etc) on reducing the flow of plastic pollution into the environment, which will inform governments and NGOs about what are the most effective strategies to reduce plastic pollution. Stephanie is collaborating with us, the Ocean Conservancy, and the Jambeck Research Group at the University of Georgia. To learn more about this work, visit:

Jan Bikker – Undergraduate Research Student


Jan is an undergraduate student studying Ecology and Evolutionary Biology. She is working on a project with Trash Free Maryland investigating the composition and distribution of microplastics in the Chesapeake Bay. This summer, she will be studying the effects of microplastics on fish behaviour in collaboration with the ABEL lab at McMaster.

Hayley McIlwraith – NSERC Undergraduate Research Fellow

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Hayley is an undergraduate student double majoring in Ecology & Evolutionary Biology and Cell & Systems Biology. Previously, Hayley has done work on microfiber release from laundry and has assisted with various projects in the lab. This summer she will be beginning microplastic sampling work across boreal lakes at the IISD-Experimental Lakes Area.

Arielle Earn – Undergraduate Research Assistant

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Arielle is an undergraduate student double majoring in Biodiversity & Conservation Biology and Political Science. She spent the summer working as an intern for the Center for Global Change Science to research the current state of knowledge on plastic pollution in the Laurentian Great Lakes. She is now helping out with a project to study the chemical and physical effects of microplastics on freshwater fish.

Anthony Carrozzi – Undergraduate Research Assistant

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Anthony is an undergraduate Life Sciences student at the University of Toronto, on track to complete a double major in Human Biology and Biology, as well as a minor in Immunology. Anthony is working with Bonnie Hamilton to examine the impact of microplastics on Arctic ecosystems, with a specific focus how seabirds may be vectors for transmission to Arctic air and blue mussels.

Lara Werbowski – NSERC Undergraduate Research Fellow

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Lara is an undergraduate student double majoring in Environmental Science and Psychology and minoring in Environmental Studies. She is researching whether or not rain gardens filter microplastics from stormwater. This project is in collaboration with the San Francisco Estuary Institute.

Dorsa Nouri Parto

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Dorsa is an undergraduate student double majoring in Ecology & Evolutionary Biology and Molecular Genetics. Last summer, she worked as an intern for the Centre for Global Change Science to study the effects of microfibers on chironomids. This year, she will be working on quantifying microfiber emissions in wastewater treatment plants.

Lauren Ead – Undergraduate Research Assistant

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Lauren is an undergraduate student double majoring in Biology and Geography. She is currently assisting in the analysis of microplastic debris in the San Francisco Bay, and wishes to pursue future research concerning ecotoxicology.

Susan Debreceni – U of T Trash Team Outreach Assistant 


Susan is passionate about connecting individuals with meaningful opportunities and spent the last decade supporting a national network of community volunteers through the Great Canadian Shoreline Cleanup. She is now thrilled now lend her outreach expertise locally with the U of T Trash team. She will be guiding and mentoring our student team as we continue to bring waste literacy to local schools and the general public.

Dr. Rafaela F. Gutierrez – U of T Trash Team Collaborator

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Rafaela is a social scientist with expertise in waste policy. She has a keen interest in up- and downstream processes for plastic recycling. Over the past decade she has studied, advocated and worked with low-income communities in Brazil focusing on how to improve socio-productive integration into formal recycling streams. She is currently a research fellow at U of T, working on food waste awareness and reduction. She is excited to be part of the U of T Trash team and to develop strategies about how to deal with plastic waste and to increase waste literacy.

Past Lab Members:

Jelena Grbic – Research Assistant

Monina Cepeda – 299 Undergraduate Student

Matthew Tulio – work study student

Dr. Anna Kolomijeca – Postdoc (Rochman and Sinton Group)

Aimee Huntington – Undergraduate Research Assistant

Cole Brookson – Undergraduate Research Assistant

Antonino Calarco – Undergraduate Research Assistant

Natasha Klasios – Undergraduate Research Assistant

Anna Lisa – Undergraduate Research Assistant