Mark Penn: MDC-Stagwell will take on 'bloated and outdated' holding companies | Campaign US
Mark Penn Tried to Sell Stagwell Group to Rival Ad Holding Companies
A Glimpse Into the Mind of Microsoft's Controversial New Strategy Chief - Bloomberg
Former Hillary Clinton aide Mark Penn leaving Microsoft - POLITICO
Mark Penn | Milken Institute
Microtrends Squared] | C-SPAN.org
Trump met with ex-Bill Clinton pollster Mark Penn to discuss impeachment | CNN Politics
Stagwell Group CEO Mark Penn on why it was time to buy a GOP firm | PR Week
Mark Penn (@Mark_Penn) / Twitter
Mark Penn Collection | Roper Center for Public Opinion Research
Stagwell | Meet Mark - Stagwell
Mark Penn - Breaking News, Photos and Videos | The Hill
Mark Penn Behind Push to Block Nancy Pelosi's Bid to Be House Speaker
Marketing Is the Answer Whether You're Growing or Struggling
Agency Transformation: An Interview with Mark Penn, Chairman and CEO, MDC Partners | Customer First Thinking
Mark Penn on building Stagwell, his political and polling background | Ad Age
Why Hillary's Former Operative Bought a Hollywood Box-Office Tracking Firm – The Hollywood Reporter
Mark Penn - Chairman and CEO - Stagwell | LinkedIn
Mark Penn | Twelve
Mark Penn's Investment Group Acquires SKDKnickerbocker
Why Mark Penn Is Sounding Trumpy - POLITICO Magazine
Mark J. Penn - The Stagwell Group
