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Halpern was last seen hiking near Taylor Peak in Rocky Mountain National Park on August 15, 1933. He had gone camping in the region with a friend. He began hiking up Taylor Peak alone, carrying an Army knapsack. He has never been heard from again. Halpern's friend notified authorities when he failed to return from his hike. In the days that followed, a snowstorm hit the area. An extensive search of the mountains turned up no sign of him.
Following Halpern's disappearance, there were unconfirmed sightings of him all over the country: in Phoenix, Arizona in December 1933; traveling with the Civilian Conservation Corps near Alliance, Nebraska in May of 1935; and traveling with the Lewis Brothers Circus in Detroit, Michigan in the summer of 1935. None of these reports were ever substantiated.
Halpern was a graduate student at the University of Chicago at the time of his disappearance, and had a summer job at an observatory in Wisconsin. He's talented in mathematics, chemistry, astronomy and chess. Authorities are no longer actively investigating Halpern's case due to the passage of time, but they have taken DNA from his relatives to identify his body if it is ever located.
Colorado Bureau of Investigation