Lloyd will work with the agency's clients to deliver maximum insight into campaigns.
At Microsoft, he led a technology consulting team within Microsoft Advertising. Before that, he worked at Omniture as a senior analyst.
He will report to David Fletcher, head of MEC MediaLab, who called him "a perfect fit" for the agency and in ensuring it has "the right skills and technologies to remain at the forefront of the media industry".
Lloyd said he had been attracted by MEC's strong leadership and innovative thinking towards digital marketing and will immerse himself in understanding consumers for MEC clients including Orange, MBNA, GoCompare and Alfa Romeo.