<prompt> Ukhiqize inguqulo eyinkimbinkimbi yalesi sigwebo wasebenza njengoMongameli kanye noMphathi Omkhulu.  <response>: Yiqiniso, inguqulo eyinkimbinkimbi yomusho ithi Wenza njengoMongameli kanye ne-CEO Irwin Wahlala neMediaVest Worldwide iminyaka engu-6 kwaze kwaba ngoSepthemba 1999 lapho ejoyina i-WPP plc njengoSihlalo kanye ne-CEO ye-MindShare Worldwide. 