Since 1994, Periscope has built a reputation as an indie shop beholden to no corporate hierarchy while also having the size and expertise big brands want. “We can look at a client’s business problem and really solve it as opposed to being inside of a holding company, [where] if you work in the media group and a client comes to you and says, ‘I have a problem,’ invariably the answer is, ‘You need a different media plan,’” explained Periscope president, CEO Liz Ross. It helps that Periscope’s 500-person staff stretches across media, packaging, creative, experiential and production with digital integrated into all departments. The content lab, for example, regularly whips up real-time social posts for brands like Trolli and Buffalo Wild Wings. And the Minneapolis-based agency’s proximity to the headquarters…