Bainbridge will join the executive board, which will now be four-strong, as its only non-executive director.
The Big Shot is a content marketing agency that produces and develops brand-led content.
The appointment has been made as the agency bids to up its client roster.
Bainbridge currently runs the marketing consultancy Bainbridge Cooper Associates.
His previous roles include communications and marketing director at the British Army and head of recruitment marketing for RBS group.
Oliver Russell, Big Shot managing director, said: "Having Mark on board is a great coup for the agency."
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