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 tell you plainly what the work showed, even when it is not what you hoped to hear.
- Licensed Oklahoma PI (CLEET) — verifiable
- Confidential, from first call to final report
- Tulsa-based since 2013
Licensed & verifiable
Nathan Alessi holds a CLEET private investigator license — Oklahoma’s real state credential, not a pay-to-display badge. You can look it up.
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
Suspicion is miserable. Get facts, quietly, before you make a decision you cannot take back.
Learn more →Child Custody
Document what is actually happening, the right way, in a form an attorney can use.
Learn more →Criminal Defense
The state has investigators. Defense counsel should too — locates, serves, and independent fact-checking.
Learn more →Workers’ Compensation
Most claims are honest. The ones that are not cost real money. We verify and document.
Learn more →Skip Tracing & Locates
Witnesses, debtors, heirs, defendants who dodge service. Finding people is the work this firm was built on.
Learn more →Background Checks
A real check looks further than a cheap database. New partner, hire, tenant, or deal.
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.
CLEET — the Council on Law Enforcement Education and Training — is Oklahoma’s licensing authority for private investigators. Nathan’s license is the state credential, renewed on a three-year cycle. It is not an association badge. Confirm he is licensed and in good standing, then pick up the phone.