Debevoise & Plimpton LLP is advising Alliant Insurance Services, the specialty insurance brokerage firm, in its acquisition of Chicago-based Mesirow Insurance Services (MIS).

Alliant provides property and casualty, workers’ compensation, employee benefits, surety, and financial products and services to more than 26,000 clients nationwide, including public entities, tribal nations, healthcare, energy, law firms, real estate, construction, and other industry groups.

The Debevoise team is led by partners Jeffrey J Rosen and Uri Herzberg and includes partner Elizabeth Pagel Serebransky and associates Usman Arain, Malinda R Bridges-Sampson, Brooke A Fodor, Simone S Hicks and Aaron Christopher West.