Your Trusted Partner in the Search for Missing Persons
Known Stranger Investigations, LLC is dedicated to reuniting families with their loved ones in the San Francisco Bay Area through specialized investigative services.
The Story Behind Known Stranger Investigations
Founded in 2023 by Martin Geisler, Known Stranger Investigations is committed to assisting in the search for runaway and missing individuals with empathy and professionalism.
Known Stranger Investigations collaborates with law enforcement and seeks permission prior to taking on a case.
Known Stranger Investigations collaborates with law enforcement and seeks permission prior to taking on a case.
Missing Persons Investigative Services
We offer personalized investigative services that include interviews, physical searches, and specialized care for individuals with autism and dementia.
Runaway Searches
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Suicidal Person Searches
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Lost Dementia & Alzheimer’s Searches
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Independent Physical Searches
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Missing Persons Cold Case Investigations
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Are You Listed as a Missing Person?
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Why Choose Us
Discover our unique commitment to families.
Experienced Professionals
Our team consists of experts with extensive backgrounds in criminal justice and sociology. We bring expertise to every case.
Compassionate Support
We understand the distress families face. Our approach is both empathetic and thorough, prioritizing your loved ones' return.
Comprehensive Services
From interviews to organized searches, our services cover every aspect of the investigation, ensuring no stone is left unturned.
Take Action Today
If you are facing the distress of a missing loved one, contact us today to discuss how our dedicated team can help bring them home.