Arthur J. Gallagher, an insurance brokerage and risk management services firm, completed the acquisition of Horn, a provider of sales and leadership development programs and consulting services across a variety of industries globally. Financial terms were not disclosed. "Horn has a strong market reputation whose expertise will enhance our leadership advisory capabilities, and they have a culture like ours. I am very pleased to welcome the Horn team to Gallagher," J. Patrick Gallagher, Chairman, President and CEO.