Wojciech Halicki is an environmental engineer and doctor of biological science. He received his Ph.D. (1998) and habilitation (post doc, 2001) in the field of ecology at the University of Vechta (Germany). He worked as a professor at the Cardinal Stefan Wyszynski University in Warsaw, Poland, in the Department of Biology and Environmental Science until 2017, and was a visiting professor at the State University in Tomsk (Russia), in Calgary (Canada), and in El Paso, Texas (USA). Currently, he is a professor at the University of Warsaw. Since 2002, he has led a private Institute for Applied Ecology in Poland. He is the author of three patents and numerous technical projects in the field of constructed wetland. Halicki is the author of five books and more than seventy publications in Polish, German, Russian, and English. He is currently conducting a research project aimed at treating domestic wastewater to the level of drinking water using constructed wetland.