Stanley McChrystal retired in July 2010 as a four-star general in the US Army. His last assignment was as the commander of the International Security Assistance Force and as the commander of the US forces in Afghanistan. He is currently a senior fellow at Yale University's Jackson Institute for Global Affairs and the cofounder of the McChrystal Group, a leadership consulting firm. Tantum Collins and Chris Fussell are his colleagues at the McChrystal Group, while David Silverman is the founder and CEO of CrossLead. He is the author of Team of Teams.