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.
Private Investigator with back to camera viewing a missing persons research board for clues.
Adolescent psychologist reassuring crying teenage boy that he is safe now.

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.
Years of Experience
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Missing Persons Cases
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Missing Persons Investigative Services

At Known Stranger Investigations, LLC, we specialize in non-criminal missing person cases, such as Runaways, Suicidal Persons, and Lost People with Dementia/Alzheimer’s.  We are aware that many people listed as missing, left on their own free will, which is not a crime.  Our Investigative Services can help in your search of a loved one if law enforcement has limited time or manpower.  We can be a secondary source of assistance in Physical Searches working day or night in collaboration with law enforcement.  We will contact friends, family members, neighbors, and co-workers of the person listed as missing.  It will be asked that they inform the person listed as missing to call us.  The goal is for the person listed as missing, Known Stranger Investigations, and law enforcement to meet in person to ensure removal of the person’s name from the missing person’s database. 

Even though we are paid by the client, are attention is primarily focused on the welfare, safety, and privacy of the person (if 18-years-old or older) listed as missing.  We take pride in selective missing poster creation and dissemination. 

Poster dissemination is primarily used for and Lost People with Dementia/Alzheimer’s and Cold Cases.  If your missing person’s case is older than a year, we can review the case from the start with a new set of eyes.  Furthermore, we can apply new search techniques and conduct searches as outlined in recent studies.        

Runaway Searches

Runaway searches are typically efforts to locate children and teenagers who have left home or care without approval.

Suicidal Person Searches

Suicidal person searches center on finding individuals who may be experiencing a severe mental health crisis.

Lost Dementia & Alzheimer’s Searches

Dementia and Alzheimer’s searches involve locating adults who may be disoriented, confused, or unable to recognize danger.

Independent Physical Searches

Independent physical searches are the organized, on-the-ground effort to locate a missing person by directly checking areas where they may be found.

Missing Persons Cold Case Investigations

Cold case investigations re-examine a missing persons disappearance after early leads have stalled or gone unanswered.

Are You Listed as a Missing Person with Us?

Being removed from a missing persons database is important once a person has been located and confirmed safe.

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.

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