RPM said in a statement that both roles came to an end from July 2010.
RPM managing director Dom Robertson said: "Ian has played a big part in the development and ongoing success of RPM Corporate, which we launched as a result of seeing a gap in the market where we could continue to provide powerful experiences, regardless of the channel or industry sector. Ian has set up an incredibly strong, committed team at RPM Corporate who will continue to achieve outstanding results, so that our clients’ investment in experiential continues to deliver maximum value. We wish him all the very best in his future endeavours."
Irving said: "I have thoroughly enjoyed the time I have spent at RPM, and supporting the launch of the Corporate Division within the existing powerful RPM proposition. The team at RPM Corporate has been set up from the best in class in the corporate communications sector, and I have no doubt will continue to be a great success."
Prior to joining RPM, both Irving and Kenny worked for agency Sledge.