Its president, Sarah Hofstetter, has also resigned. The CEO role will be filled by Dale Fuller in the interim although Comscore said it had no plans to fill Hofstetter’s role.

Wiener (pictured) said in a statement: “I have been very fortunate to lead Comscore during a period of significant change and to be part of a talented team turning around the company strategically, financially and reputationally. I chose to leave as the board and I had irreconcilable differences over how to execute the company’s strategy.”

Wiener became CEO in April last year having been on its board since October 2017. He was previously executive chairman of Dentsu-owned 360i and was Comscore’s third CEO in two years.

Wiener took over from Gian Fulgoni who retired in November 2017 and before Fulgoni, Serga Matta held the position until he left in 2016.

The changes in CEO come as Comscore has had to fix its financial reporting, following accounting irregularities. In 2017 is reported losses of more than $280m.  

Comscore has made three appointments to its board of directors: Irwin Gotlieb, a former GroupM CEO and chairman; Joanne Bradford, chief marketing officer of Social Finance; and Kathi Love, a former president and CEO of GfK MRI.  

Brent Rosenthal, chairman of the board of directors, said: "We believe today’s appointments will [add support] our strategy, improve our customer traction, accelerate our growth and drive long-term shareholder value. We are thrilled to have Irwin, Joanne and Kathi join our team and further enrich our board with diverse skill-sets from the digital, media and technology marketplaces."