Marsh was an effective player in ODI matches, contributing as a keeper and a lower order batsman. His power and aggression was put to good use in the closing overs, when he could score at a rapid rate. In one match against New Zealand in 1980–81 against Lance Cairns at the Adelaide Oval, he struck 26 from the final over, with three sixes and two fours, before falling on the final ball. Coaching and other non-playing duties Marsh was a cricket commentator for Channel Nine's international matches between 1986–1990 and 1996–1998. He was a coach at the Australian Cricket Academy in Adelaide since its inception and was its director from 1990 to 2001. Some of his former proteges include Australian internationals wicketkeeper–batsman Adam Gilchrist and fast bowlers Jason Gillespie and Brett Lee. Marsh was the Director of the England and Wales Cricket Board (ECB) national academy from October 2001 to September 2005. During this time, England went from being a mediocre team to challenging Australia as the best team in Test cricket and in 2005, they regained the Ashes after 16 years in Australian hands with a 2–1 win. Marsh later criticised the ECB for releasing Troy Cooley, who had trained England's four pronged pace battery, and attacked Duncan Fletcher's selection of Geraint Jones as the wicket keeper ahead of Chris Read. He once declared his cricketing allegiance to England and was at one time a selector for the English team. In August 2006, the South Australian Cricket Association announced Marsh had been appointed in a consultancy role to undertake a review of cricket throughout South Australia. Marsh had also worked with the Global Cricket Academy in Dubai. He was included in a part-time capacity as a part of the Cricket Australia national selection panel in 2011. In 2011, in a newly created role by Cricket Australia he was asked to coach the coaches in order to ensure a unified approach to mentor the players across the states of Australia. Marsh was appointed chairman of selectors for Cricket Australia on 2 May 2014, replacing John Inverarity. He was previously Cricket Australia's manager of elite coaching development. He felt the heat at times from former cricketers including Michael Slater for not selecting Usman Khawaja in the Australian playing XI especially during the Chappell-Hadlee ODI series in February 2016 in New Zealand. On 16 November 2016, Marsh resigned as chairman of selectors,