[1] Greenwood grew up in the small coastal town of Port Neill on the Eyre Peninsula, and moved to Whyalla in his teens.

In 2007, he played eleven games in the Port Adelaide seniors in the SANFL at the age of just eighteen.

Finished equal second in the best and fairest 2014 before requesting a trade to the Collingwood Magpies.

The deal was finalised on the second last day of trade week with Collingwood sending pick 25 in return for Greenwood.

[3] In June 2021, Greenwood announced his retirement from football following complications resulting from concussions sustained during his career.