Date of death: October 1st, 1998
Race/Nationality: Caucasian
Gender: Male

Greg was assigned to an unnamed facility in Raccoon City.[1] During his time there, he was involved in the events surrounding the Arklay hospital and the illegal human drugs trials being conducted there.[2] At one point, he began researching into the experimental "Tyrant"-class B.O.W., which he attempted to develop on his own. The fruit of his work was "Thanatos", a seven-feet-tall killing machine. Unlike other Tyrants made that year, Thanatos was a very intelligent, strong, and agile creature.
However, when Umbrella began plans to mass-produce the Tyrant, Greg became furious, believing that this would take away from the individuality and uniqueness of his subject. Like many Umbrella researchers, Greg viewed his creations as works of art, and not mass production weapons as Umbrella intended, refusing to help them any further.

To further spite Umbrella, Greg helped Peter Jenkins, a Raccoon University professor, to create a cure for the t-Virus, Umbrella's most prized viral weapon.