NEW YORK (AdAge.com) -- In an era when marketing strategies seem more complicated than ever before, author Jonathan Cahill is selling simplicity. And he backs it up with 115 case studies. Prior to opening his own London firm, Spring Marketing Innovation and Research, Cahill spent 30 years as an ad man with major agencies in the UK and Italy. His recently published book is entitled "Igniting the Brand: Strategies That Have Shot Brands to Success." And one of his conclusions is that marketers and their agencies are trying so hard to devise strategies that they often look right past simple truths.