When the Resonance Cascade and resulting Black Mesa Incident occurred, Kleiner managed to escape Black Mesa, although exactly how remains unexplained. The Anomalous Materials team before the Black Mesa Incident. At this time, Kleiner also was on friendly terms with many co-workers, namely Gordon, Eli and Barney, although Richard Keller mentions at the start of Decay that he does not understand what Kleiner sees in Freeman. Kleiner also appeared to be a Hazardous Environment Supervisor or Instructor, as the Hazard Course Training Schedule sent by Gina Cross to Colette Green mentions that Kleiner was slated to instruct Green for a Hazardous Materials Handling on May 9, 200-, although it was postponed to June, and ultimately did not happen due to the Black Mesa Incident. to other employees, such as his letter regarding Barney Calhoun's new Blue Shift assignment, sent on May 9, 200-, and L.M.'s letter to Colette Green regarding the Xen crystal swap prior to the incident. Kleiner appears to have been working with administrative jobs prior to the Black Mesa Incident in Sector C, as he received carbon copies of several letters, from L.M. The hair was Photoshopped on a screenshot of his model. In Black Mesa, Kleiner would also compete for grant money with Arne Magnusson.Ī brown-haired Isaac Kleiner on the cover of Popular Scientist. When Freeman showed interest in a job at Black Mesa, Kleiner recommended him for employment in the Civilian Recruitment Division, and this recommendation combined with Freeman's experience at the Institute for Experimental Physics in Innsbruck, Austria, ensured that he got the position instead of his competitor, Judith Mossman. Kleiner would later take employment in the Sector C Test Labs of the Black Mesa Research Facility, where he worked with Eli Vance and security guard Barney Calhoun.ĭuring this time, Kleiner appears to have become a widely recognized scientist, seeing that he is on the front cover of the magazine Popular Scientist, apparently in an article called 'Next level of quantum physics', as well as the author to at least one book, From Here to There in Under a Second, likely about teleportation. It appears that the two started their friendship already back then, and that Kleiner was quickly impressed by Freeman. Kleiner first worked as a professor at MIT, where he was one of the mentors of Gordon Freeman. The second page of L.M.'s letter, where Kleiner is mentioned for the first time.

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