Licensed Tulsa PI · Since 2013
Get the answers you need from a licensed Tulsa private investigator.
Alessi Investigations is a professional, confidential private investigation firm in downtown Tulsa. We locate people, document facts, and serve process. Then we put it in a written report.
- Licensed Oklahoma PI (CLEET) — verifiable
- Confidential, from first call to final report
- Tulsa-based since 2013
Licensed & verifiable
Nathan Alessi is licensed as a private investigator in Oklahoma. The credential is public. You can confirm it yourself in the state’s registry.
Confidential
Sensitive work stays quiet. We do not discuss cases, and we will tell you if email or a web form is the wrong place for details.
Tulsa since 2013
A downtown office, statewide process serving, and more than a decade of locates, surveillance, and case support for families and law firms.
Services
What we actually do.
Process serving, surveillance, locates, and case support — for individuals, attorneys, and businesses. If a job is not a fit, we will say so before you spend.
Process Serving
Locate, serve, and document it so the case can move — including defendants who do not want to be found.
Learn more →Surveillance
Planned, lawful observation when it is the right tool — and a clear no when it is not.
Learn more →Marital Infidelity
Not knowing is its own kind of damage. Quiet documentation, then a clear report, before you make a move you cannot reverse.
Learn more →Child Custody
Document what is actually happening, the right way, in a form an attorney can use.
Learn more →Criminal Defense
Prosecutors come with a file. Defense needs its own: locates, subpoena service, and independent fact-checking.
Learn more →Workers’ Compensation
Legitimate injuries deserve to be paid. Fraudulent ones do not. We verify activity and put it in writing.
Learn more →Skip Tracing & Locates
Hard-to-find witnesses, people who owe money, missing heirs, and defendants who will not accept papers. Locates are this office’s core skill.
Learn more →Background Checks
A printout from a consumer site is not a background check. We look at records that actually exist before you hire, lease, or sign.
Learn more →
Why hire this firm
Straight answers. Then the work, if it is warranted.
I started Alessi Investigations in early 2013. I had already done research-heavy work in oil and in medicine, and I had a knack for finding people who did not want to be found. I sat the state’s tests, passed the background checks, and have been licensed ever since.
Paralegals and law firms hire this office for difficult serves and sensitive locates. Families hire us when they need facts, not a performance. You get the same standard either way: legal methods, a written picture of what we found, and no theater.
Licensed & verifiable
Look up the license before you call.
Oklahoma licenses private investigators through CLEET. Nathan’s license is listed in the public registry and has to be kept current. Confirm he is in good standing, then pick up the phone.