Dr Sanjeev Kumar is a Consultant Medical Oncologist at Chris O'Brien Lifehouse and Royal Prince Alfred Hospital. He grew up in regional Australia, completed undergraduate medical studies at UNSW, and trained as a Medical Oncologist in Central Sydney and in the United Kingdom.

He embarked on a Cancer Drug Development fellowship with the University of Cambridge UK in 2015 and was subsequently awarded a University of Cambridge and Cancer Research UK scholarship in 2016 to complete a cancer molecular biology PhD at the Cancer Research UK Cambridge Institute, with a focus on Oestrogen receptor-positive breast cancer.

Sanjeev returned to Australia in 2019 to continue his clinical and academic focus on breast cancer. His clinical interests include the treatment of young women with breast cancer, neoadjuvant therapy approaches, and treating high-risk breast cancers. He has a keen interest in the education of trainees, public engagement, and clinical trials.