After a 7 year career as technical officer in the Royal Netherlands Navy and 13 years as a consultant, mainly in an aviation regulatory and technical environment, Stephan joined NS Dutch Railways in 2015 as certification manager at the Haarlem refurbishment depot. In addition to various alteration projects on NS rolling stock, Stephan was – and still is – the certification and safety manager for the refurbishment and modernization of the VIRMm1 EMU trainsets of NS, and more recently also the VIRMm2/3 EMU trainsets. He represents NS in the Vehicle Authorization and TSI LOC&PAS/WAG Support Groups of the Community of European Railway and Infrastructure Companies (CER), pro-actively shaping future EU railway legislation. Stephan also participates in the ERA OSS User Group. He played a key role in preparing NS for the transition to the 4th Railway Package, which entered into force in the Netherlands on the 16th of June 2019. He lives just north of Amsterdam with his wife and two daughters.