Before joining NBS, Professor Janusz Brzeszczyński worked at Heriot-Watt University in Edinburgh and held a number of visiting positions at the universities abroad in the USA, Germany, Switzerland and Poland.

He was awarded Fulbright scholarship (Senior Grant) at the Arizona State University in the USA, Humboldt Fellowship for Experienced Researchers at the University of Münster in Germany, ESKAS federal scholarship at the Swiss Institute of Banking of Finance at the University of St.Gallen in Switzerland and DAAD research scholarship at the Kiel University in Germany.

Professor Janusz Brzeszczyński published in such top journals as: “Journal of International Money and Finance”, “Journal of Comparative Economics”, “Journal of International Financial Markets, Institutions and Money”, “Journal of Business Ethics”, “European Journal of Finance”, “International Review of Economics and Finance”, “Applied Financial Economics“, “International Review of Financial Analysis”, “Journal of Pension Economics and Finance”, “Emerging Markets Finance and Trade”, “International Journal of Finance and Economics”, “Finance Research Letters”, “Expert Systems with Applications”, “Journal of Financial Stability”, “Energy Journal” and “Energy Economics”, among others.

He acted also as a consultant for Reuters and did research projects for various banks and other financial institutions. 

Professor Janusz Brzeszczyński served on the Editorial Board of the “Emerging Markets Finance and Trade” journal and he is currently a Senior Editor at the "International Journal of Emerging Markets" and an Associate Editor at the “Finance Research Letters” journal.

His other roles at the NBS included in the past the Acting Head of the AFM department and the Director of Research in the AFM department. Professor Janusz Brzeszczyński is currently the Head of Subject Group (Finance) in the AFM department.

Professor Janusz Brzeszczyński was invited to present his research at such financial institutions as BlackRock in San Francisco, RiskLab in Munich or National Bank of Poland (NBP) in Warsaw and at the research seminars at top research universities such as the University of California San Diego (UCSD), IESE Business School in Barcelona, University of San Francisco (USF) and Booth School of Business at the University of Chicago.