Short answers, pulled from the story.
Monty Oum was an American web-based animator and writer, born on the 22nd of June 1981 in Providence, Rhode Island. He is best known for creating the animated series RWBY at Rooster Teeth and for the viral fan animation Haloid, which combined characters from the Halo and Metroid franchises.
Haloid was a fan-made animated video Oum released in January 2007, depicting a fight between a Halo SPARTAN and Metroid's Samus Aran. Oum built it by reverse-engineering character models from Halo 2 and combining them with assets from Super Smash Bros. Melee. Its technical precision attracted widespread attention in the gaming community and led gaming companies to contact Oum within two months of its release.
Oum created RWBY at Rooster Teeth, an original animated series featuring high-intensity fight sequences between super-powered characters. Two seasons were completed before his death in February 2015, with a third in production at the time. The show went on to run for nine seasons total.
Oum died on the 1st of February 2015, at 4:34 p.m., in Austin, Texas, from anaphylaxis. He suffered a severe iatrogenic allergic reaction during a simple medical procedure on the 22nd of January 2015, fell into a coma, and did not recover. He was 33 years old.
A GoFundMe page set up for Oum's medical expenses received over $210,000 in donations. Rooster Teeth co-founder Burnie Burns publicly announced Oum's critical condition on the 30th of January 2015, and the fundraising response reflected the size of the community he had built through his work.
After Haloid went viral in 2007, Oum was hired by Midway Games as a combat designer. In 2008 he joined Namco Bandai Games as a combat designer and animator on Afro Samurai. He found the professional game industry frustrating and eventually joined Rooster Teeth, which was announced at PAX East 2010.