Mark, 55, was last seen at 6pm yesterday (Sunday 17 April) in Platts Common, Hoyland and was believed to be heading towards Wombwell.
Mark is white and uses a wheelchair. He is believed to be wearing a black coat, cargo trousers, hiking boots and a black hat.
Have you see him? Please call 101 and quote incident number 874 of 17 April if you have any information.