In Firewatch, there are notes to be found throughout the map which can tell Henry more about the past.
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WAPITI STATION PERSONNEL
If you are trying to reach Dr. Simmons, he is on-site from August 15 - October 15. University owned equipment is the responsibility of Dr. Johson.
Government owned equipment is under the purview of Kat Ferdinand. Remember, this is a controlled area and any issues, malfunctions or violations should be reported immediately.