Principals: Jack Martin, global chairman and CEO; Dan Bartlett, US president and CEO
Ownership: WPP
Subsidiary agencies: Public Strategies, Wexler & Walker Public Policy Associates, Blanc & Otus, Soho Partners, PBN Hill+Knowlton Strategies
Offices: Global: 85 wholly owned; US: 15
Revenue: Global: $350 million to $400 million; US: $100 million to $150 million
Headcount: Global: 2,250 to 2,500; US: undisclosed

Hill+Knowlton Strategies started and ended 2011 in dramatic fashion. The firm formally merged with WPP sister agency Public ...