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Peak Investigations
30+ years Police Officer, Homicide Investigator, Forensic Interviewer, Deputy Medical Examiner, Criminal Prosecutor.
AZDPS License #1662143 / #1662144
Meet Glen Dunsbergen – Arizona Licensed Private Investigator
Glen Dunsbergen (AZDPS Licenses 1662143 / 1662144) is a licensed, bonded, and insured Arizona private investigator based in Phoenix. With more than 30 years of investigative and courtroom experience, he provides direct, one-on-one service to clients facing complex and high-stakes matters. When you retain Glen, you work directly with him—no intermediaries and no outsourced casework.
His career includes roles as a Police Patrol Officer, Police Detective, Homicide Investigator, Deputy Medical Examiner, Domestic Violence Program Director, Victim Advocate, and Criminal Prosecutor.
Serving Phoenix, Scottsdale, Mesa, Tempe, Chandler, Gilbert, Glendale, Peoria, Surprise, and all of Maricopa County and the entire state of Arizona.
Some Professional & Confidential Services We Offer
From personal matters to complex legal cases — we uncover the truth with experience you can trust.
Adoption Screening Investigations
Through the analysis of online forums, social media activity, legal records, and digital footprints, we assist adoption agencies and families in assessing the lifestyle, stability, and overall credibility of all individuals involved.
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Background Checks Enhanced by OSINT
At Peak Investigations, our background checks extend well beyond basic civil and criminal history searches by utilizing advanced Open Source Intelligence tools.
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Divorce & Cheating Spouse Investigations
We delivere court-ready evidence using traditional methods and digital, open sources, saving our clients time, money, and stress.
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Cold Case Homicide Investigations
At Peak Investigations, we combine traditional investigative techniques with cutting-edge OSINT methods to bring fresh insight and renewed momentum to cold case homicides.
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Social Media Investigations
People from all backgrounds—both criminals and law-abiding individuals—leave millions of digital footprints daily; by analyzing this data, we can often resolve cases efficiently without relying on costly traditional surveillance methods, saving you both time and money..
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Child Custody Investigations
From social media activity and public posts to digital traces that expose false claims of sobriety, employment, or home stability—we provide clear, court-admissible documentation.
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Asset Searches
At Peak Investigations, we specialize in uncovering hidden assets using a combination of traditional investigative methods and powerful OSINT tools.
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Corporate Investigations
Protect your business with comprehensive corporate investigations including employee background checks, fraud investigation, and due diligence services.
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Your case deserves expert insight to uncover the truth
Every decision is backed by verified intelligence.
30+ Years of Proven Experience
Decades of hands-on experience in homicide, law enforcement, and legal investigations.
Licensed, Bonded & Insured
Arizona DPS certified and professionally trained by State and Federal Level Agencies.
One-on-One Confidential Service
Every case is handled personally by Peak Investigators — private, secure, and discreet.
Why We Use Open Source Intelligence (OSINT)
Peak Investigations focuses on uncovering critical information with the assistance of advanced social media investigations. By leveraging specialized OSINT tools, we examine open-source public and semi-public data from platforms such as Facebook, Instagram, Reddit, and others to identify hidden relationships, behavioral patterns, and valuable leads —where millions of digital interactions occur every day—these techniques often allow us to resolve cases without the cost and complexity of traditional surveillance, helping clients save both time and money.
Lower Costs, Better Results
OSINT often reveals key information without the high expense of physical surveillance or long-term stakeouts.
Fast, High-Volume Intel
Our tools collect and analyze massive amounts of digital data in real time—so you get answers quickly.
Up-to-Date Information
We monitor constantly changing sources like social media, forums, and online records to provide the most current insights available.
Latest Posts & Announcements
Explore the world of private investigation — through experience, facts, and updates.
Guide
What to Know Before Hiring a Private Investigator
Hiring a PI is a serious step. This guide covers what to expect, legalities, and your rights.
January 10, 2025
OSINT
How Social Media Can Help Solve a Case
Modern investigations rely on OSINT — and platforms like Facebook or LinkedIn can reveal powerful leads.
January 5, 2025
Trusted by Clients Across Arizona
We've helped individuals, families, and attorneys uncover the truth with integrity and discretion.
"I hired Peak Investigations to look into a delicate family matter. His professionalism, discretion, and deep knowledge gave us peace of mind during a stressful time. Highly recommended!"
— Sarah M.
Phoenix, AZ
Private Client
"Peak Investigations' experience shows in every step of the process. He found details no one else could. If you want real answers, he's the one to call."
— Jason T.
Scottsdale, AZ
Attorney at Law
"I was hesitant to contact a private investigator, but Peak Investigations made me feel safe and heard. He handled my case with care and helped uncover the truth I needed."
— Angela R.
Scottsdale, AZ
Family Law Client
Let's Talk — No Pressure, No Obligation
Your story matters. Speak directly with Glen and get the answers you deserve.
Call Us Directly
(602) 341-3703Serving
Phoenix, Arizona & Statewide
Get in Touch Confidentially
Your privacy is our priority — share your concerns, and let’s find the truth together.
Peak Investigations is dedicated to uncovering the truth with integrity, experience, and absolute discretion. Whether it’s a personal matter or a complex cold case, we are here to help you find the answers you deserve.
Quick Links
Services
Contact
- (602) 341-3703
- info@peakinvestigations.com
- Phoenix, Arizona & Statewide
Areas We Serve in Arizona
Phoenix • Scottsdale • Mesa • Tempe • Chandler • Gilbert • Glendale • Peoria • Surprise • Tucson • Flagstaff • Yuma • Prescott • Sedona • Lake Havasu City
© 2026 Peak Investigations. All Rights Reserved.
Licensed Private Investigator in Arizona | AZDPS #1662143 / #1662144