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Open Source Intelligence

Better information for better decision making

We provide tailored training solutions at advanced and professional levels, including classroom, online and in-house programmes, designed to meet our customers' specific needs. Planned, systematic, structured OSINT research to find exactly what you need.

OSINT since 1990 as chief Open Source Intelligence for the Dutch Defence Intelligence and Security Service.

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Full training programmes | workshops | online/offline | in-house training | consultancy | advice | audits

Reuser's Information Service

Delivering Top Class OSINT Training Programmes

OSINT Unlocked

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osint unlocked

Our latest blog posts

Vague questions in OSINT … and what to do

So I ask OSINT students to solve a modest research assignment any way they see fit. They all listen carefully to me, then turn around to the computer screens and frantically start typing. After a few minutes I call them

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learn learn learn

This series of posts will hold information on learning possibilities offered by Reuser’s Information Services. We shall also cover consultancy here. Stay tuned! […]

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Study Report Unlocking the Value of Open-Source Intelligence (OSINT) for Customs Enforcement

Open-Source Intelligence (OSINT) is the process of collecting, analysing, and utilizing information that is publicly and commercially available to support intelligence and decisionmaking processes. It has become increasingly popular in recent years. Deriving from the Publicly Available Information (PAI) that

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osint unlocked

Our latest blog posts

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About us

Who we are

Founder and manager (ret.) of the Open Source Intelligence branch of the Dutch Defence Intelligence & Security Service since 1991, Internet since 1990, guest lecturer universities of Texas, Leiden, OSINT researcher, writer, speaker, consultant, OSINT trainer and mentor…

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About us

What we do

Reuser’s Information Services is concerned with delivering top class OSINT training programmes, in-house as well as open, on a variety of levels and capabilities.

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OSINT Training

Let's prepare together!

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Fletcher Wellness-Hotel Leiden

OSINT Pathfinder

€ 1.789,- incl. 21% VAT (btw)

Fletcher Wellness-Hotel Leiden

OSINT Master

€ 1.948,- incl. 21% VAT (btw)

Fletcher Wellneshotel Leiden

OSINT Intelligence Analysis

€ 1.989,- incl. 21% VAT (btw)

Online

OSINT Explorer

€ 1.650,- incl. 21% VAT (btw)

Our Experiences

Our Unique Strengths

We provide a combination of extensive industry knowledge, proven leadership experience, and professional support to deliver effective intelligence solutions that meet the highest standards. 

35+ years experience in OSINT

Decades of experience delivering top-tier open-source intelligence services.

20 years chief OSINT

Leadership by a seasoned OSINT expert from the Dutch Defence Intelligence Service.

Professional Librarian Support

Meticulous research supported by professional library science, ensuring accuracy and depth in intelligence analysis.

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OUr reviews

What our customers are saying

It is an art to cover so much information yet not make the participants feel overwhelmed.
Very good job.

I could have used another day, it was so interesting

The book seems excellent. Looking forward to digging deeper into areas that we skipped. I suspect that there is enough to allow me to self study and fill in those gaps

You have so much knowledge and the repertorium is a wonderful way for you to share this with us (at least some)

I loved the course and the dynamic between Arno and Marjon that comes with that. Everyone got along, no one was left behind, it was all very clear. Very easy to understand, even if you have no experience. My enthusiasm on OSINT has only grown!

Arno’s teaching style is very direct and accurate which means you get the maximum amount of information from interactions with him.

The course is excellent, but more time is needed to fully absorb the given material.

This course was EXACTLY what I needed and was looking for.

Arno’s teaching style is very direct and accurate which means you get the maximum amount of information from interactions with him.

Excellent we get printed hard copies of everything as that is rare nowadays with most training courses.

Great reference materials that are clearly written and that I can use after the course. Rather extensive

Stunning, I don’t think I have every seen so many useful sources in one place.

Clear AND “great tempo” AND “breaks were perfectly timed” AND “fun” AND “loved that it was sooooo interactive” NOT boring NOT long enough (jokes aside: really enjoyed the course, I do admit I got a little intimidated in the beginning to ask questions but I’m glad that at one point you mentioned ” there are no stupid questions”).

Pathfinder is such an eyeopener, that I started studeing for the Master, just to learn more an dmore. A thrikking and marvelous three day course.

I participated in the OSINT Pathfinder training program, and I am still amazed by the skills I learned from Mr. Arno Reuser. He is a true source of inspiration and knowledge, wrapped in a briljant mind and beard. I would describe his training as nothing short of exceptional.

thank you once again for the wonderful OSINT Pathfinder course. It was truly an enlightenment – having done several OSINT courses already, non of these provided such a good, clear and important methodology as yours.
Last week I completed Arno Reuser’s OSINT Pathfinder course. Amazing course that teaches you how to systematically do OSINT and gather information. I can fully recommend this course to anyone, that’s right, even to the ‘non-techies’. This 3 day course is packed with handy tips & tricks as well as containing a lot of Arno’s experience. Special thanks to Arno!

It shows how much Arno is into this OSINT world. Great to be his student!

The website is already a Mecca for ‘OSINTers’, amazing. The book and training website will be the most precious bases to start off and polish my skills in the upcoming period.

Extremely helpful and thank you for the treasure-toolkit with sources

As an officer that does vetting of persons and companies using online sources, I have found the course to be very informative and indeed timely in showing me additional ways of doing vetting using online sources. Has also enriched my knowledge of online academic research

There were longstanding questions I had on open source intelligence and open source investigations that this course has answered for me. It has also exposed me to additional knowledge on methods of vetting companies and persons.

The course really helps to structure research. You can use the knowledge even with other intelligence analysis.

Very well organized and very well structured course spanning across the entire area of knowledge related to OSINT operations.

As a professional teacher I appreciate the light hand of the teacher, the Dutch way of being understated but effective without the British show off. I learned a lot and I hope I can emulate in my job

Covers all you need to know to understand what modern OSINT is and how it’s supposed to be done professionally.

One of the best training I have had in my 16 year career with the U.S. Marshals Service and my 4 years in the U.S. Marine Corps. Very useful for intelligence analysts and law enforcement investigations.

I now know the importance of generating queries for research purposes especially in my papers.

I was looking to immerse myself in OSINT to learn more about researching effectively.

Very organized curriculum with toolbars, training website, quick reference materials, and training handbooks.

The book and training website are very impressive and comprehensive.

Liked the “philosophical” approach to open source research in general and not only focus on tools. One of the most useful courses I have been on.

I needed a proven method of researching and that was provided.

Extremely knowledgeable, slightly too fast for me if I’m honest (but that is a reflection on my ability compared to the majority of the class), however Arno is patient and always available to go through things later if need be

Arno is a subject matter expert with an excellent reputation.

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Open Source Intelligence (OSINT) offers specialized training and consulting services focused on improving intelligence analysis through open-source data collection.

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Marjon van Dijk,

Manager & Hostess
Reuser’s Information Services