Suntosh is a health, social justice, and LGBTQ+ scholar-activist. He works in Durban as the Chief Clinical Psychologist for the eThekwini district, in the KwaZulu-Natal Department of Health, South Africa. He has worked in the public service for over 15 years, since completing his Masters degree in clinical psychology as a Mandela Rhodes Scholar. He co-founded a non-profit mental health advocacy group that now organizes South Africa's largest, free mental health awareness walk. In 2016, he completed the Young African Leadership Initiative (YALI) at Florida International University, Miami, as a Mandela Washington Fellow.

As a researcher, he is affiliated to the Nelson R. Mandela School of Medicine at the University of KwaZulu-Natal (UKZN), and is widely published in academic journals, including the Lancet Global Health. He serves on the editorial boards of both the South African Journal of Psychology (SAJP) and Psychology in Society (PINS).

Suntosh is also an active member of the Psychological Society of South Africa (PsySSA), the nationally representative body for psychologists. He serves on the executive committees for two divisions: the Community and Social Psychology (CaSP) and Sexuality and Gender (SGD). His work in the field of LGBTQ+ studies is well reputed. In 2022, he was featured in documentary on queer rights, "When the Rainbow in Bittersweet". He is a co-author of (South) Africa's only set of Practice Guidelines for Psychology Professionals Working with Sexually and Gender Diverse People, which has been widely translated and used across the world, including in Nigeria and Cameroon. In July 2024, the updated version of these guidelines will be launched at the International Congress of Psychology in Prague, Czech Republic.

He is co-editor of the book, Chasing Freedom (CODESRIA Press).

Suntosh is always open to connecting and collaborating with others who share his passion for research and activism related to mental health, sexuality, and/or social justice.