From 1989 to 1992, Harrison served as head of development for Mindscape International, and prior to that as a game designer and graphic artist in the UK. Since joining Sony in 1992, he has held executive management positions in Europe and North America – where he served as Vice President, 3rd Party Relations and Research and Development for Sony Computer Entertainment America from 1996 to 2000. He has been a core member of the teams that successfully launched all of the PlayStation family of hardware formats and software that have helped expand the market for computer entertainment worldwide. A 1995 article in Next Generation called Harrison "Sony Computer Entertainment's European PlayStation primary evangelist." In September 2005, Sony Computer Entertainment unified its regional product development operations under a global structure, Sony Computer Entertainment Worldwide Studios, and appointed Harrison to serve as President of the new organization. Working closely with Sony's studios in Japan, Europe and North America, Harrison was responsible for setting the global product strategy and managing development operations of 13 studios in Japan, UK, the Netherlands and the USA. On 25 February 2008, Sony announced Harrison's resignation from the company effective 29 February. On 3 March 2008, Infogrames Entertainment SA announced Phil Harrison as their new Directeur Général Délégué. Later that year he gave interviews in which he predicted that single-player games were to become increasingly rare as consumers wanted "network connectivity" and "community". On 29 May 2009, it was announced that Harrison had become the non-executive director of Atari, following the company's shift to a US-based publishing company, and the renaming of Infogrames Entertainment SA to Atari. On 19 April 2010, Atari announced Phil Harrison had resigned from the company's Board of Directors. On 17 May 2010, it was announced that Phil Harrison has joined the advisory board at David Perry's cloud gaming service known as Gaikai. On 13 March 2012, it was announced that Phil Harrison had joined the Interactive Entertainment Team at Microsoft. On 17 April 2015, it was announced that Phil Harrison had left Microsoft Game Studios. On 22 January 2018, it was announced that Phil Harrison had joined Google as a vice president and general manager. On 19 March 2019, Sundar Pichai announced by that Google had created a new gaming platform Stadia with Harrison as product manager.
