Wiener (pictured) was most recently executive chairman of Dentsu-owned innovation and data-focused ad agency, 360i. He has sat on comScore’s board since October 2017.

ComScore has been searching for a CEO since Gian Fulgoni retired in November 2017, amid a torrid time for the business as it tries to straighten its financial reporting after accounting irregularities. Last month, it reported its first annual figures for three years.

Wiener is its third CEO in two years – Fulgoni had taken over from Serge Matta who left in August 2016

With Wiener taking over as CEO, Bill Livek, comScore’s current executive vice-chairman and president – who has been overseeing the role since Fulgoni retired – will move to the new role of vice-chairman of the board and special advisor to the CEO. The new roles will take effect on 30^th May.

The company also announced that Rob Norman, former chief digital officer of WPP’s GroupM, has joined its board of directors. Current board member, Brent Rosenthal, has been made non-executive chair.

Livek said: “Bryan is a universally-respected change agent in the business world, known for specialising in growing companies into market leaders, and I am thrilled to welcome him to the comScore executive team.”

Wiener added: “I’m energised by the opportunity to join comScore during this pivotal moment for our business and our industry. In a world where people are increasingly consuming media across platforms, the need for a trusted, objective and consistent currency to measure audience and advertising ROI only grows.”