Dr Shireen Kassam is a Consultant Haematologist and Honorary Senior Lecturer at King’s College Hospital, London with a specialist interest in the treatment of lymphoma. She is also a Visiting-Professor at University of Winchester, Hampshire, where she has developed and facilitates the UK's first University-based course on plant-based nutrition.

Shireen is passionate about promoting plant-based nutrition for the prevention and reversal of chronic disease and for maintaining optimal health after treatment for cancer. In 2019 she became certified as a Lifestyle Medicine Physician and is also a CHIP facilitator.

Shireen founded Plant-Based Health Professionals UK in 2018, a non-profit, membership organisation whose mission is to provide evidence-based education on whole food plant-based nutrition. In January 2021, she co-founded and launched the UK's first regulated, plant-based, lifestyle medicine healthcare service Plant Based Health Online.

Shireen qualified as a doctor in 2000. During her training, she completed a PhD investigating the role of selenium in sensitising cancer cells to chemotherapy. Shireen has published a number of peer-reviewed papers in the field of lymphoma. Her first book, Eating Plant-Based: Scientific Answers to Your Nutrition Questions, co-authored with her sister Zahra, was published in January 2022.