Arthur J Gallagher, a global insurance brokerage and risk management services firm, completed the acquisition of ROC Group, an employee communication agency specializing in human resources and enterprise change solutions. Financial terms were not disclosed. "ROC Group is a leading employee communication firm with an outstanding culture, and their products and services complement our existing benefits and HR offerings. I am delighted to welcome Jan and her associates to Gallagher," J. Patrick Gallagher, Arthur J Gallagher Chairman, President and CEO.