Dr. Chris van Tulleken

Xand and Chris van Tulleken, known as "Dr Chris" and "Dr Xand", are British doctors, television presenters, and identical twin brothers. They are best known for presenting the Operation Ouch! Children's television series. Chris has become well known for his two-part television special for BBC One entitled The Doctor Who Gave Up Drugs. Xand has also presented shows without his brother.