Knight takes on the role of senior vice-president for international marketing and expansion.
He joins from eBay, where he was vice-president of international marketing before becoming vice-president of internal communications.
Cash4Gold president and co-founder Howard Mofshin said: 'David has already been instrumental in our UK launch. His will be a huge advantage for us.'
Knight has previously worked for companies including PepsiCo, where he was vice-president of international marketing for its Gatorade brand. In this role, he rolled out the brand's first global integrated marketing campaign across Europe, Latin America and Asia.
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