Thinkbox research chief Brennan set to leave in July

His plans for the future are unknown, saying only that he wants to pursue other opportunities. A search is under way for his successor.

Brennan joined Thinkbox in September 2006, having previously worked for Daily Mail publisher Associated Newspapers as head of group strategic insight.

Before joining Associated, Brennan ran his own media consultancy in Australia, working predominantly with broadcast and interactive media clients. He was also responsible for designing and implementing the research programme behind the BBC’s launch of UKTV.