Ronald Greer (Stargate)

Ronald Greer
Jamil Walker Smith as Ronald Greer
First appearance	"Air"
Portrayed by	Jamil Walker Smith
Information
Species	Human
Gender	Male
Occupation	United States Marine Corps Master Sergeant
Family	Reginald Greer (father) Angela Greer (mother)

Master Sergeant Ronald Greer, USMC is a fictional character from the science fiction television series Stargate Universe, the third live-action series from the Stargate franchise centering on a group of 80 soldiers and civilians trapped on the Ancient vessel Destiny. He is portrayed by Jamil Walker Smith. Greer holds the rank of Master Sergeant and is described as "big, strong, silent".

Greer is brought up by his loving mother Angela Greer and abusive father Reginald Greer. Greer's father deprived him of food; physically abused both his wife and Ronald; and would lock him away in a cupboard, making Greer claustrophobic in later life. Ronald enlists in the United States Marine Corps after failing to get the scholarship he was seeking. He eventually is incorporated into the Stargate Program at the rank of Master Sergeant, serving at Icarus Base. He is shown to be quick to anger, which Rush assumes is the result of having come from a poor background. Before the base attack that led to the evacuation to Destiny, he was imprisoned and awaiting court martial for assaulting Colonel Telford in front of a staff meeting at Icarus base prior to the attack. Greer's commanding officer, Everett Young, releases him after the base falls under attack, telling him to consider the charges against him dropped.

On board the Destiny, he works side-by-side with Matthew Scott, who was put in charge after Colonel Young was injured, following the attack on Icarus Base. On the first mission to retrieve a needed mineral off-world, Nicholas Rush reveals that Greer was not on his list for Icarus Base personnel.