MacGillivray replaces Lindsey Clay, who was made Thinkbox’s first managing director earlier this year. He will report into Clay when he takes up the new role.
As head of content, MacGillivray had responsibility for strategy, development, editorial and production across Thinkbox’s website, events, film production, DVDs and editorial.
A new head of content will be announced “in due course”, according to a Thinkbox spokesman.
MacGillivray joined Thinkbox as content editor when it was formed in 2005 and has also held a variety of creative roles at independent marketing agency Sponsorvision.
Thinkbox also recently appointed Neil Mortensen as its research and planning director, to replace David Brennan who left the body to “pursue other activities”.