Marc, whose second name has not been released by officers, is 61, and was last seen at around 9.30am on Friday (April 19/4) in Henley.
He has been described as ‘white, 5ft 7 ins tall, slim build, short to medium length grey hair’ and was wearing navy blue trousers, blue shoes and a black hooded jacket.
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He has access to a car which is a black VW Polo partial registration RA55. He is known to also frequent Bracknell and Ascot.
Investigating officer Sergeant Charlie Smith, said: “We are appealing for the public’s help in tracing Marc.”
Anyone with information is urged to contact police quoting reference number 43240179448.