Cousins began in the group operational research department of Cadbury-Schweppes in 1981, being involved in market research and investment projects. In 1984 he joined BTR Industries, again in operational research. He became corporate planning manager for Newey and Eyre, one of its subsidiaries and an electrical components firm. In 1990 he moved to BPB plc, the British firm which is the world's largest manufacturer of plasterboard and now owned by the French company Saint-Gobain. He went on to be managing director of Abertay Paper Sacks in 1996, President and CEO of Westroc Inc in February 1998 and Group chief executive of BPB in April 2000. Cousins joined Compass in May 2006 as CEO. In 2017, Cousins was named #11 on the 2017 100 Best Performing CEOs in the World by Harvard Business Review; in 2016 he placed 17. He is succeeded as CEO of Compass by Dominic Blakemore. Originally planned for 1 April 2018, the succession was brought forward to 1 January 2018.
Personal life
Cousins married Caroline Thorpe in 1982; she died of cancer in 2015. Their two sons were William and Edward, both of whom died with their father. They resided in the Chilterns and Tooting, South London. The couple had previously lived at Wellington, Shropshire late in the 1980s, where Cousins was a player in the Cricket Club, of which he remained for some time chairman of the club committee.
Death
Cousins was killed on 31 December 2017 when the light aircraft he was on crashed into the Hawkesbury River in Australia near Cowan, north of Sydney. His two sons, William Cousins and Edward Cousins, his fiancée Emma Bowden and her daughter Heather Bowden-Page as well as pilot Gareth Morgan, were also killed in the accident. Emma Bowden was the daughter of Gerald Bowden, the former ConservativeMember of Parliament for Dulwich. Cousins, a keen cricket fan, was to attend the Fifth Test of the Ashes series in Sydney with his two sons; the seats were left empty. A year before his death, Cousins changed his will to include a "common tragedy clause", so that if he and his children were to die at the same time, the bulk of his fortune would go to charity. This resulted in the charity Oxfam receiving a £41 million bequest from his estate.