Dr Michael Mosley missing
A community Facebook group on Symi shared a photo of Dr Mosley wearing a blue polo shirt a cap and sunglasses, appealing for information.
The post reads: "Have you seen this man? He set off to walk back from St Nick's at about 13.30 and failed to make it home.
"His friends are concerned as it is 6 hours since they last saw him.
"His name is Dr Mike Mosley and he is a familiar face for many British people as he has appeared on the BBC.
"The police and coast guard have been informed EMAK, the island's rescue team, is also involved."
