While playing for Upper Canada College in Toronto, Ontario, Greening was selected by the Ottawa Senators in the seventh round, 204th overall, of the 2005 NHL Entry Draft. Greening played four full seasons of NCAA collegiate hockey at Cornell University without missing a single game, serving as captain in his junior and senior year and being selected for membership in the Quill and Dagger society. At Cornell, Greening played on a line with another future NHLer, Riley Nash.\n', '

After graduating from Cornell in 2010, Greening joined the Binghamton Senators of the American Hockey League (AHL), the top minor league affiliate of the Ottawa Senators. He made his NHL debut on February 1, 2011, in a game in Newark against the New Jersey Devils. On March 3, 2011, Greening scored his first career NHL goal against the Atlanta Thrashers in a 3–1 Ottawa victory. On May 19, 2011, Greening was signed to a three-year, one-way contract by the Senators that will pay him $700,000 in 2011–12, $800,000 in 2012–13, and $950,000 in 2013–14.\n', '

On January 12, 2012, Greening was selected to participate in the NHL YoungStars Game, which coincided with the 2012 All-Star Game held in Ottawa. He finished his rookie season with 17 goals and 37 points while playing in all 82 of Ottawa\'s games, largely playing on the first line with Daniel Alfredsson and Jason Spezza.\n', '

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