Dr Thomas Pennington is a general surgeon with a subspecialty interest in melanoma, soft tissue oncology and endocrine surgery. He has a special interest in minimally invasive surgery for pelvic lymph node disease and management of intra-abdominal metastases. He trained in general surgery at St Vincent's Hospital, Darlinghurst and was the General/Endocrine Surgery Fellow at Hornsby Hospital in 2017 and Poche Surgical Fellow at MIA in 2018.

Dr Pennington is currently a VMO at Royal Prince Alfred Hospital and Northern Beaches Hospital, and has accreditation at North Shore Private Hospital, The Mater Hospital, Sydney Adventist Hospital and Sydney Day Surgery, Prince Alfred. He is also a Senior Clinical Lecturer at The University of Sydney.

Dr Pennington's clinical research is focused on surgical management of melanoma in the modern era. He is an active investigator in clinical trials examining the role of neoadjuvant and adjuvant immunotherapy in patients with high risk Stage II and Stage III melanoma.