Sebastian studied medicine at  “Iuliu Hatieganu” Medical School, Cluj-Napoca, Romania and trained as a junior doctor in Nephrology and Dialysis before moving to USA where he obtained a PhD from the University of Nebraska-Lincoln in 2004.This was followed by postdoctoral training at Duke University Medical Center (North Carolina, USA) where he became interested in studying the connections between alternative splicing and cancer. In 2008 he moved to the University of Bristol where he continued to study alternative splicing in vivo, with focus towards the importance of several genes splice isoforms (e.g VEGF, FGFR2) in cancer as well as kidney diseases and development of splice-based therapeutics. In 2012 he was appointed Independent Research Fellow and Principal Investigator and developed his own research group in Bristol before moving to University of Exeter Medical School in 2017.