Omnicom and WPP veteran Dru Sil has been appointed to the new post of global product managing director at Stagwell Media Platform.

  Independent agency The Variable today announced the appointment of Courtney Williams as Chief Growth Officer and Partner.  Williams joins from The Martin Agency, where she most recently served as vice president--head of business development. Earlier she served at 22Squared and BBDO Atlanta.    Over the past year, The Variable …