CEO and global chairman, Hill+Knowlton Strategies
Jack Martin spent much of 2011 on a plane getting to know the global empire he had assumed power over from previous incumbent Paul Taaffe in a coup that surprised everyone except perhaps those who had seen the no-nonsense Texan in action at close range.

Martin became part of the iconic H+K family when his Public Strategies firm – also owned by WPP – was merged with Taaffe's outfit in fall 2010. By January, Taaffe had ...