The person at the center of this case
Joseph Laurence Halpern
Missing Person · Open
92 years waiting · since 1933
Missing Person: Joseph Laurence Halpern
Justice for Joseph Laurence Halpern — the trail went cold in 1933, but the truth hasn't.
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Key leads to think about
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person
Lead #1Did Joseph Halpern actually survive and relocate, or do these 1934-1935 sightings represent misidentifications?
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evidence
Lead #2What happened to his army knapsack and the clothing he was wearing on the day he disappeared?
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clue
Lead #3Why did he use the alias 'Louis Hollenbuck' and was called 'teacher' by co-workers—what was his background and occupation?
Joseph Laurence Halpern, a 22-year-old man, disappeared on August 14, 1933, while hiking near Taylor Peak in Rocky Mountain National Park, Colorado. Unsubstantiated reports placed him in Phoenix, Arizona in late 1934 and traveling with various groups in the Midwest in 1935, though his actual fate remains unknown. The case remains open, and anyone with information about his whereabouts or these reported sightings is urged to contact the Rocky Mountain National Park Service.
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More leads to consider
Beyond the top three above — each detail below could be the thread that pulls this case open.
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location
Lead #4Were search efforts conducted in Rocky Mountain National Park after his disappearance, and were any remains or equipment ever found?
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Official wording
Source Narrative
NamUs case MP2797. Missing person: Joseph Laurence Halpern.
Last known contact: 1933-08-15 in Estes Park Vacinity, Larimer, CO. Circumstances: Disappeared on August 14, 1933 while hiking in Rocky Mountain National Park near Taylor Peak.Unsubstantiated reports place him in Phoenix, AZ in December of 1934, with the Lewis Brothers Circus in Michigan in the summer of 1935, traveling with CCC near Alliance, Nebraska in May of 1935.He may have used the alias Louis Hollenbuck and was called "teacher" by co-workers.
He was also a computer at the Aberdeen Proving Grounds in 1932. Demographics: 22 years, Male, White / Caucasian.
Physical description: 5 ft 8 in, 165 lbs, hair: Brown, eyes: Brown. Clothing and accessories: Accessories: Had an army knapsack with him.; Clothing: Light blue shirt, light brown trousers.
One report notes white shirt with blue stripes.; Footwear: Heavy shoes or mukluks.. Investigating agency: Rocky Mountain National Park Service | 1933-08-15.
Timeline of Events
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1933-08-14
Disappeared while hiking
Joseph Laurence Halpern disappeared while hiking near Taylor Peak in Rocky Mountain National Park
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1934-12
Unsubstantiated sighting in Phoenix
Unconfirmed report placing him in Phoenix, Arizona
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1935-05
Reported traveling with CCC
Unsubstantiated report of traveling with Civilian Conservation Corps near Alliance, Nebraska
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1935-06
Reported with Lewis Brothers Circus
Unsubstantiated report placing him with Lewis Brothers Circus in Michigan
Key Locations
Interactive map showing important locations related to this case
Case Information
Incident:August 14, 1933
Last Updated:July 9, 2026
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Any information, no matter how small, could be crucial to solving this case.
Phone: 9705861206
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Case Information
Incident:August 14, 1933
Last Updated:July 9, 2026
Have Information?
Any information, no matter how small, could be crucial to solving this case.
Phone: 9705861206
You can remain anonymous