Dr hab. Ewa Matuszczak Medical University of Bialystok Pediatric Surgery and Urology Department Waszyngtona 17 15-274 Bialystok, Poland Assistant (2001), adjunct (2017) at Pediatric Surgery and Urology Department Medical University of Bialystok (MUB). Specialist in pediatric surgery since 2008. Member of Polish Association of Pediatric Surgeons since 2001, Secretary of regional division of Polish Association of Pediatric Surgeons 2003-2005, Treasurer of Polish Association of Pediatric Surgeons 2009-2012, Treasurer of Regional Division Polish Association of Pediatric Surgeons 2012-2016, Chairman of Division in Bialystok 2016-2020. Fellowship at Department of Pediatric Urology, University Children's Hospitals UMC Utrecht (2005), Paediatric Endoscopic Surgery Workshops at Leeds Teaching Hospital UK (2014), European Society of Paediatric Endoscopic Surgeons Workshops Marseille, France (2015) Scientific achievements on changes in the protein degradation system - the ubiquitin-proteasome system (UPS) in the course of burns, injuries and inflammatory diseases in children and pathophysiological implications of cryptorchidism.