|Date of birth||16 June 1982|
|Place of birth||Georgetown, Guyana|
|Height||5 ft 8 in (1.73 m)|
|2011–2013||Puerto Rico Islanders||17||(2)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 9 April 2013
‡ National team caps and goals correct as of 21 February 2017
Richardson formerly played for Georgetown FC and Camptown Georgetown in his home country, and for Joe Public from Trinidad and Tobago. While playing for Joe Public in the CONCACAF Champions League 2008–09 Preliminary Round he scored a hat-trick, helping his team eliminate New England Revolution, and bringing himself to international attention.
He was waived by Colorado on 27 June 2009, only making one appearance for the club. After a successful trial with the Carolina RailHawks the club announced the signing of Richardson on 9 July 2009. He became an instant impact where he was able to register his first hat trick in a 4–0 victory over Miami FC. He scored the fastest goal in club history against Puerto Rico Islanders at the second minute. He finished off the season as tied in first for most assists with five, and was the second highest goal scorer with six goals. He helped his Carolina side clinch a playoff spot by finishing second in the regular season standings. On 5 February 2010 Carolina re-signed Richardson to a one-year deal with a club option for 2011.
Richardson is a current member of the Guyana national football team, having scored 15 goals in 39 games.
- Scores and results list Guyana's goal tally first.
|1.||6 September 2006||Ergilio Hato Stadium, Willemstad, Curaçao||Suriname||1–0||5–0||2007 Caribbean Cup qualification|
|2.||24 November 2006||Bourda, Georgetown, Guyana||Antigua and Barbuda||1–0||6–0||2007 Caribbean Cup qualification|
|4.||26 November 2006||Bourda, Georgetown, Guyana||Guadeloupe||2–0||3–2||2007 Caribbean Cup qualification|
|5.||28 November 2006||Bourda, Georgetown, Guyana||Dominican Republic||1–0||4–0||2007 Caribbean Cup qualification|
|6.||13 January 2008||Providence Stadium, Providence, Guyana||Saint Vincent and the Grenadines||1–0||1–0||Friendly|
|7.||5 November 2008||Marvin Lee Stadium, Macoya, Trinidad and Tobago||Saint Kitts and Nevis||1–1||1–1||2008 Caribbean Cup qualification|
|8.||9 November 2008||Marvin Lee Stadium, Macoya, Trinidad and Tobago||Trinidad and Tobago||1–0||1–1||2008 Caribbean Cup qualification|
|9.||11 September 2012||Providence Stadium, Providence, Guyana||El Salvador||1–0||2–3||2014 FIFA World Cup qualification|
|10.||21 October 2012||Beauséjour Stadium, Gros Islet, Saint Lucia||Saint Vincent and the Grenadines||1–1||1–2||2012 Caribbean Cup qualification|
|11.||23 October 2012||Beauséjour Stadium, Gros Islet, Saint Lucia||Curaçao||2–0||2–1||2012 Caribbean Cup qualification|
|12.||25 October 2012||Beauséjour Stadium, Gros Islet, Saint Lucia||Saint Lucia||3–0||3–0||2012 Caribbean Cup qualification|
|13.||21 February 2016||Providence Stadium, Providence, Guyana||Suriname||1–0||2–0||Friendly|
|15.||22 March 2016||Providence Stadium, Providence, Guyana||Anguilla||5–0||7–0||2017 Caribbean Cup qualification|
- Walker, Monique (3 September 2008). "'Public' gives a schooling". The Boston Globe. Retrieved 7 March 2009.
- "Archived copy". Archived from the original on 25 March 2009. Retrieved 22 March 2009.
- "RailHawks add Richardson". uslsoccer.com.
- "Richardson returning to RailHawks". NASL.com. Archived from the original on 3 March 2016. Retrieved 6 February 2010.
- [dead link]
- "The Puerto Rico Islanders sign forward Gregory Richardson". PR Islanders FC. Retrieved 15 April 2011.
- [dead link]
- "Richardson, Gregory". National Football Teams. Retrieved 21 February 2017.