Janusz Krzymień, MD, PhD, was born in Poznań in 1948. He studied at the Medical University of Warsaw in the years 1966-1972. As a student, he was a member of Student Research Club at the Department of Gastroenterology and Metabolic Diseases of the Medical University of Warsaw (former 3rd Department of Internal Medicine). After graduating from the Faculty of Medicine, he worked at the Department, first on a not-for-profit basis (he was banned from work in Warsaw), and was officially employed in 1973. In 1978, he obtained the first-degree specialization in internal medicine. He was actively involved in the establishment and management of Intensive Diabetic Care Unit, later transformed into Intensive Diabetic Care Division.
He was the main founder of the Bank of Technical Resources for Diagnosis and Treatment of Diabetes, an institution which has significantly contributed to the reduction of perinatal death rates for infants of diabetic mothers, and has developed the existing diagnostic recommendations for gestational diabetes mellitus. In 1983, he obtained the second-degree specialization in internal medicine, and the PhD degree in medical sciences. Together with Professor K. Ostrowski, Professor Janusz Krzymień runs the Intensive Diabetes Care Division as a long-standing assistant professor.
In the years 1997-1999, he was the Deputy Manager for Clinical Affairs at the Independent Public Central Clinical Hospital SPCSK in Warsaw. In October 2014, he was appointed the acting Head of the Department of Gastroenterology and Metabolic Diseases of the Medical University of Warsaw.