Mr. Riečan previously worked in various positions at the United Nations Economic Commission for Europe on numerous statistical topics, including macroeconomic statistics, population and housing censuses, and migration statistics. The primary focus of his work was on statistical infrastructure, including data and metadata models, data quality, data dissemination and communication, and the use of administrative registers and records for statistical purposes.
In his academic career, Mr. Riečan focused on mathematical statistics, notably on regression models applied in biology, medical research and mechanical engineering. Mr. Riečan holds a PhD in Mathematical Statistics. His thesis focused on applications of the Kolmogorov Consistency Theorem.