John Montgomery is a specialist in Brand Safety and Trust in the Digital Media Industry and heads up the Global Brand safety practice in GroupM, which he established in 2017 after concerns raised by clients over quality in the digital supply chain. In 2021, John became an advisor to GroupM but still holds the above title. John is seen as one of the digital innovators in the field where he helped found organizations like DAA, GARM and TAG. John speaks regularly on issues like Brand Safety and Integrity and the effect of Quality in the digital supply chain. As part of his role, John has represented the advertising industry to the US Senate Commerce Committee and Chaired the American Association of Advertising Agencies (4A’s) Media Council. He is a board member or Advisor to several non-profit and for profit companies.