His work focuses on genetic background of monogenic diabetes and type 2 diabetes and diabetes complications, as well as clinical studies in diabetes, in particular relating to pregnancy. He authored and co-authored about 180 scientific articles, including about 120 original ones; his works have been cited until 2014 over 330 times (IF about 550, Hirsch index 23). He is a member of the Executive Board of the Polish Diabetes Association (since 2007), Vice-President of the Association since 2011, President–elect of the Polish Diabetes Association. He was a member of the board of the European Society of Clinical Investigation. A member of the European Association for the Study of Diabetes, EASD expert for etiological diabetes. He participates in the works of the Study Group on Genetics of Diabetes (SGGD-EASD). In 2011, he received an award of the Polish Diabetes Association for achievements in the field of diabetology, and in 2005 he was invited to give Węgierko lecture during the Congress of the Polish Diabetes Association. For outstanding scientific achievements he was honoured with the Prime Minister award (2006) and a team award of the Minister of Health (2009). In 2013, he received the Borowicz Award of the Polish Academy of Skills and in 2014 – the Jagiellonian Laurel and Śniadecki Award of the Polish Academy of Sciences.
He is a reviewer of Endocrine Review, Diabetes, Diabetes Care, Diabetologii (Diabetology), Diabetic Medicine and numerous national journals as well as an editor of European Journal of Clinical Investigation and Diabetologia Praktyczna (Practical Diabetology). He is an EU expert for evaluation of scientific projects under the FP6 and the FP7 Ideas framework programme. He published papers in the leading world scientific journals, among others in Nature Genetics, Nature Clinical Practice Neurology, New England Journal of Medicine, Diabetes, Diabetologii (Diabetology), Diabetes Care, Stroke, Neurology, etc. In 2008–2012, he was the Vice-dean of the Medical Faculty of the Collegium Medicum of the Jagiellonian University for organisation of studies and curriculum, currently a representative of the Rector of the Jagiellonian University for research and development in the Collegium Medicum of the Jagiellonian University.