Private Investigator Services

Cornerstone Investigative Services, Inc provides private investigator and private detective services throughout Oregon and nationwide.  Investigations are conducted by professional, licensed private investigators and research analysts that are experienced in getting the answers or information you need.  We offer a FREE discreet telephone consultations.  We can answer most questions you may have about hiring a private investigator.  Please call us today at (503) 575-2836 to speak with one of our investigators.

If we take your case, we will begin with a review of your objectives and then recommend an investigative plan to meet your needs.  As the case progresses, we continually evaluate the information as it develops and reassess as is necessary.

Background Investigations

  • Relocation Investigations
  • Public and Court Record Research
  • Day Care Providers
  • Estate and Trust Issues
  • Fiancée/Boyfriend/Girlfriend Domestic Research
  • Missing Persons Search
  • Witness Locations
  • Criminal Record Searches
  • Child and Elder Care Providers
  • National and International Watch Lists

Locate Investigations

  • Relocation Investigations
  • Locate individuals to have court papers served
  • Skip Tracing
  • Missing Persons Search
  • National and State Vehicle Sightings
  • Witness Locations

Domestic/Family Surveillance

  • Infidelity Investigations
  • Pre-Marriage Background Research
  • Children, Teen and Young Adult Issues
  • Missing Family Member Search
  • Heir Locations
  • Surveillance

Corporate Investigations

  • Due Diligence Investigations
  • CEO/Executive Officer Vetting
  • Company/Business Merger Research
  • Management and Executive Research
  • Employee Background Check
  • Employee Criminal Record Searches
  • Corporate Asset Research

Asset Investigation

Asset investigations identify tangible and intangible assets owned by individuals or businesses.  Asset investigations are used in a variety of situations, such as collection of a debt, judgements, child support and alimony, purchasing a business and other situations.

Opposition Research Political Investigation

In the politics of the United States, Opposition Research (also called Opp Research or Political Investigations) is the practice of collecting information on a political opponent or other adversaries.   Providing research to candidates, political parties, and interest groups that drive successful campaign strategies.

For more information, please call us: 1 503-575-2836

Mission Statement

To be regarded as one of the finest private investigative agencies in the United States by our clients, law enforcement, and all others who come in contact with any member of our Team has always been our foremost objective.
To conduct ourselves and perform our investigations with the utmost Professionalism, Integrity, and Diligence with Respect, Dignity, and Compassion for everyone.


We understand our client’s needs for confidentiality.  We uphold the highest standards of confidentiality to ensure that client’s interests are protected at all times.


Professionalism will be exercised at all times and in all aspects of our operations, with respect and honor without compromising integrity.


A commitment to common goals based on open and honest communication while showing concern and support.

Portland Private Investigators, here to help!
(503) 575-2836


Our staff of licensed, experienced private investigators will handle all of your legal and personal investigative needs in the most professional, skilled, and cost effective manner.


Cornerstone Investigative Services, Inc – Portland Private Investigators
One World Trade Center
121 SW Salmon St., Suite 1100
Portland, OR 97204
By Appointment Only
(503) 575-2836


Oregon State Lic. 69507

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