[3] Greene was called to the bar of England and Wales in 1953 and practised law in London for several months, returning to Newfoundland in September of that year.
Prior to being elected, Greene was counsel to the International Woodworkers of America's Newfoundland local.
[4] The election also saw the defeat of Conservative leader Malcolm Mercer Hollett after Smallwood personally unseated him run in his St. John's West riding.
In 1967, during the federal Progressive Conservative leadership election, he supported the candidacy of E. Davie Fulton.
[7] He served as chair of the board of regents for Memorial University, as a director for Churchill Falls (Labrador) Corporation and as president of the Kiwanis Club of St.