Widely known for presenting the CBBC kids' educational series Operation Ouch! alongside his twin brother Chris van Tulleken. He has also presented the BBC and Channel 4 series Horizon, Secret Life of Twins, and Medicine Men Gone Wild.
He earned his master's degree in public health from Harvard University. He studied there as a Fulbright Scholar.
He has worked with the World Health Organization in tackling health crises in the international community. He was featured on the Channel 4 series Doctor In Your House in November 2015.
He is seven minutes older than his twin brother Chris.
He has frequently co-hosted alongside his brother Chris van Tulleken for the BBC and Channel 4.