Brendan started caving while studying Medicine at Sheffield University, which rapidly developed into a passion for the underground world. He joined Derbyshire Cave Rescue Organisation while an undergraduate, becoming the team doctor in 2005, and is still a core member and team leader. He continued his caving through medical training, both in the UK and undertaking expeditions to places as varied as Spain, Morocco, China, Crete and Borneo. In 2016 he was appointed as a Consultant in Anaesthesia and Intensive Care Medicine at the Mid Yorkshire Hospitals, where he is the lead for Burns Anaesthesia and Burns ICU. In 2017 he was elected Medical Officer for the British Cave Rescue Council, and also coordinates the MREW Casualty Care Exam. In November 2021 he was one of the hundreds of rescuers involved in the lengthy and complex rescue from Ogof Ffynnon Ddu.