Dr Kristeleit is a highly esteemed Consultant Medical Oncologist at Guy's and St Thomas' NHS Foundation Trust, where he has been serving since 2009. He is also the Clinical Director for Oncology at the trust. Dr Kristeleit completed his undergraduate studies at the Universities of Bonn (Germany), Lausanne (Switzerland), and Barts and The London School of Medicine, earning a first-class medical degree from Bonn University. He undertook his postgraduate and specialist training in London teaching hospitals.

Dr Kristeleit has a profound interest in breast cancer, having spent four years as an AVON Clinical Research Fellow at the Breakthrough Breast Cancer Research Centre. During this time, he investigated novel targets in familial breast cancer. His expertise extends to both early and advanced stages of breast cancer, and he provides specialist breast cancer clinics at Guy's Cancer and King's College Hospital.

As a principal and chief investigator on numerous clinical trials, Dr Kristeleit has significant experience in antibody drug conjugates and immunotherapy. His contributions to the field are well-recognised, and he is frequently invited to speak at national conferences and international meetings. Additionally, he regularly lectures at the University of London, sharing his extensive knowledge with the next generation of medical professionals.

Dr Kristeleit is dedicated to advancing the treatment of breast cancer and improving patient outcomes through innovative research and clinical practice. His areas of expertise include the treatment of early and advanced breast cancer, with a focus on cutting-edge therapies and personalised patient care.