Clarke will join Adding Value as director of strategy. He initially joined P&MM in 1998 as head of travel operations before leaving for Worldspan International. He returned to P&MM in early 2003 as director of events and communications.
Clarke told C&IT: "I resigned from P&MM in September to pursue new challenges. I have known and respected Tina Morris and Randle Stonier at Adding Value for a good number of years and it was flattering to have been asked to join them at such an exciting time of growth.
"I take with me useful big agency experience of course, but for me personally, it feels right and timely to join this creative and nimble company."
"In addition to my role at Adding Value, I will also be growing a small, niche business that I've started up in the field of luxury travel. This way I can stay in the events and communications industry that I love, with a company that I respect and admire, while also being able to satisfy my desire to diversify outside of the core events arena.
Tina Morris, managing director of events at Adding Value, said: "Chris is someone I have known for many years and I deeply respect this experience and professionalism. We are all looking forward to a lot of laughter as we work hard to make a difference for clients."
This follows the news last month that P&MM's events division is to merge with Zibrant Global Events to form Zibrant Live.