The move will see Irving "pursue new ventures" and he is not expected to be replaced.
"After 11 years, the time is right for me to leave Sledge and to pursue new ventures. These are very interesting times and I am currently looking at new challenges within the experiential industry," said commercial director Irving.
"I'll be remaining with Sledge until the end of September ensuring a smooth handover and helping the team to hopefully celebrate successes at the forthcoming Event Awards," he added. "I've had a great time at Sledge and have been privileged to work with a fantastic team of very talented people."
Sledge CEO Nic Cooper thanked Irving for his time with the firm, which has seen the agency work with companies such as Innocent, Nivea and O2.
Irving has been in the marketing communications industry for over 15 years and has held a variety of roles from production to project management. He joined Sledge in 1999.
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