- Didaktis, Educational Publisher House, Bratislava, Slovak Republic
- Financial and Market Treatment Institute, Wilmington, DE, USA
- Algoritmus, Publisher, Ostrava, Czech Republic
- Avenira Foundation, Luzern, Switzerland
- University of South Bohemia, Ceske Budejovice, Czech republic
- University of British Columbia, Vancouver, Canada - until 2016
- Didactic Institute, Bratislava, Slovak Republic
- Didactic Institute, Ceske Budejovice, Czech Republic
- SEI Co. (Safety Engineering & Improvement Company) - until 2017
- Curriculum Publisher
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