Mijn Wortels conducts genealogical research in commission. The services Eric provides are:
- Research in Dutch archives;
- Online research in Dutch and international websites;
- Transcribe and translate documents;
- Analysis of documents;
- Make research plans;
- Make research reports with detailed source citations;
- Advice for breaking brick walls.
- Research in the Netherlands in the seventeenth century;
- Military history.
Eric works according to the Genealogical Standards of the Board for Certification of Genealogists, and the Code of Ethics of the Association of Professional Genealogists. Eric is a member of the Association of Professional Genealogists.