In this AdExchanger Talks podcast, Lynda Clarizio, President of US Media at Nielsen, talks in depth about Nielsen's evolving research approach, which combines the company's classic panel-based approach with new digital and "census" methodologies. She also addresses critics of Nielsen and how networks have responded to Nielsen reports of linear TV declines. (They sometimes blame the ref.) And the discussion ends with a discussion of women in the media and ad tech sectors. Episode sponsored by Google AdSense.

Brian Lesser was promoted to run GroupM in North America last year after building its Xaxis trading desk into a billion dollar business. "My job is to transform GroupM to be much more about gathering data about consumers, because that's where our leverage is going to come from in the future." In this inaugural AdExchanger Talks podcast episode, Lesser discusses the evolving transparency debate, GroupM's ad tech investments and changes to the holding company model.  Episode sponsored by Google.