Christian is a dishy doctor and television presenter, best known for presenting Channel 4's Supersize vs Superskinny and Embarrassing Bodies alongside Pixie McKenna and Dawn Harper. One of the main show features of 'Supersize...' is a weekly comparison between an overweight person, and an underweight person. The two are brought to a feeding clinic, and live together for five days, swapping diets all supervised by Dr Jessen. He studied medicine as an undergraduate at University College London, receiving his MBBS degrees in 2000. He holds an MSc degree in sexual health, and has a particular interest in HIV and malaria, which were the focus of his work for two years in Kenya and Uganda. Alongside his television career, Jessen is a doctor in a clinic in London and has worked privately in the UK oil and gas industry - as well as for the Australian, New Zealand and Canadian immigration services. Jessen provides occupational health for London Underground and Virgin Trains. Currently he works more in the field of sexual health and HIV.