|Date of birth||September 12, 1992|
|Place of birth||Summit, New Jersey, United States|
|Height||1.98 m (6 ft 6 in)|
|Playing position||Defender, Defensive midfielder|
|Pittsburgh Riverhounds SC|
|2016||→ Colorado Springs Switchbacks (loan)||4||(0)|
|2016||→ Charlotte Independence (loan)||7||(0)|
|2017||→ Pittsburgh Riverhounds (loan)||10||(0)|
|2018–||Pittsburgh Riverhounds SC||5||(0)|
* Senior club appearances and goals counted for the domestic league only and correct as of June 27, 2018|
Greenspan was selected in the second round (26th overall) of the 2015 MLS SuperDraft by Colorado Rapids. He initially put his soccer career on hold due to military service obligations but came to an agreement with the Navy and Rapids in June 2015, allowing him to fulfill his military requirements and play for the Rapids. Greenspan made his professional debut in a 4–1 win in a Lamar Hunt U.S. Open Cup over the Colorado Springs Switchbacks. He served a year of active duty before the Navy transferred him to the Navy Reserve, allowing him to pursue a soccer career.
- "The Official Web Site of Naval Academy Varsity Athletics - Joseph Greenspan Bio". Navysports.Com. Retrieved 2015-06-18.
- "MLS SuperDraft: Joe Greenspan". Coloradorapids.com. 2015-01-15. Retrieved 2015-06-18.
- "Rapids add Joe Greenspan to roster for MLS games". Coloradorapids.com. 2015-06-05. Retrieved 2015-06-18.
- "HOUNDS SIGN DEFENDER JOE GREENSPAN". Riverhounds.com. Retrieved 12 January 2018.