Morgan originally worked for the company between 2000 and 2004 as an event manager.
He rejoins EC&O from Epsom Racecourse, where he was head of sales.
Morgan's role will focus on exhibition sales as well as managing existing relationships with exhibition organisers.
"We are delighted to welcome Karl to the team, he brings with him a wealth of experience from both the exhibition and conference sectors and completes our outstanding exhibition sales team," said EC&O commercial director Anna Golden.
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