**Aleksander Hejna**

Dr. Aleksander Hejna graduated from the Faculty of Chemistry of Gdansk University of ´ Technology in 2013 with a MSc degree in Materials Engineering. Then, from 2013 to 2017, Dr. Hejna pursued his PhD thesis at Department of Polymer Technology. For his scientific activity during his PhD, he was awarded the Scholarship of the Ministry of Science and Higher Education for Doctoral Students for Outstanding Achievements.

Since 2019, Dr. Aleksander Hejna has been a researcher at the Faculty of Chemistry, Gdansk University of Technology, where he is Principal Investigator in two research projects. The first one is the project *Structure and properties of lignocellulosic fillers modified in situ during reactive extrusion*, which is funded by the National Science Center, under the Sonatina program. The second project, entitled *Development of technology for the manufacturing of foamed polyurethane-rubber composites for the use as damping materials*, is financed by the National Center for Research and Development within the Lider program.

During his research work, Mr. Aleksander has cooperated with many domestic and foreign research centers, among which are Universitat Politecnica de Catalunya (Barcelona, Spain), Institute ` for Color Science and Technology (ICST) (Tehran, Iran), Latvian State Institute of Wood Chemistry (Riga, Latvia), Universidad de Pais Vasco (San Sebastian, Spain) or Zhejiang University of Technology (Hangzhou, China).

His scientific output consists of almost 70 scientific publications, three chapters in monographs and 21 conference papers presented at international and national conferences. His research papers have been cited more than 950 times (according to the Scopus database), so his Hirsch index is 17. In addition, four solutions developed by Mr. Hejna and his team are the subject of patent applications, and two are under patent protection.
