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