He has contributed to developing educational programs for Indigenous communities in Ontario, establishing healthcare facilities in Uganda, and enhancing medical infrastructure in Gaza.

Thomson is the founder of the Keys of Health Fellowship and co-founder of EmpowerGaza, initiatives aimed at supporting local healthcare systems in marginalized regions.

[citation needed] Since 2013, Thomson has lectured at the Islamic University of Gaza (IUG) Medical School on nephrology and internal medicine, adapting the curriculum to address the challenges of resource-limited, conflict-affected settings.

[9][10] Thomson’s research focuses on healthcare delivery in underserved populations, including Indigenous communities and humanitarian settings, as well as on social determinants of health.

In a recent article for The Conversation in partneship with McMaster University, he examined the complexities surrounding access to life-saving dialysis treatments in conflict zones.

[29][30][31][32] Thomson founded the Keys of Health Fellowship,[33] a program designed to train and empower local healthcare professionals in Gaza and other marginalized regions.

[37] He advocates for a ceasefire and raises awareness about the human rights violations, severe shortages of medical supplies, damaged infrastructure, and the need for international intervention to prevent further collapse.

[43] Thomson also addressed the Palliative Care in Humanitarian Aid Situations and Emergencies on the dialysis crisis facing Gaza's kidney patients.

[48] Following his medical missions to Gaza after October 7, Thomson joined the #EyeWitnessGaza Campaign to provide witness statements detailing the healthcare crisis in the region.

[51] Initially, Mackenzie Health issued a statement asserting that certain social media posts did not align with the organization’s values and reiterated its commitment against hate, violence, human rights violations, and terrorism.

[54] A media investigation reported that screenshots from a Facebook group called "Canadian Jewish Physicians" allegedly show doctors discussing filing safety complaints against Thomson, irrespective of their validity.

[56][57] The Canadians for Justice and Peace in the Middle East (CJPME) suggested that Thomson’s suspension, following his social media post, reflects what they describe as anti-Palestinian racism (APR).