Steve Riley, creative head at Allen Design Group, is leaving the Barnsley-based agency after 19 years.
Riley is moving to Five Talents in Halifax where he will become creative director.
"The time has flown, but now is the right time for a more creative and rewarding challenge," he said.
Anthony Allen, managing director of Allen Design Group, told The Drum that long-standing designer Stephen Delaney would be taking the vacant creative head post.
Allen added that the agency is looking to recruit two further staff with "integrated" backgrounds.