Before being elected to the state parliament, Klein was marketing and sales manager of an Aschaffenburg company. He was managing director of the research institution Zentrum für Telematik e. V. in 2014 and worked as a research consultant for EU projects at the University of Applied Sciences in Aschaffenburg from 2015 until he moved to the Bundestag. From 2008 to 2013 Klein served as a member of the
State Parliament of Bavaria. During that time, he was a member of the Budget Committee and served as his parliamentary group's spokesperson on the state's budget. Klein became a member of the Bundestag after the
2017 German federal election. He was a member of the Budget Committee and the Audit Committee. In this capacity, he served as his parliamentary group's
rapporteur on the annual budgets of the
Federal Ministry of Health and the
Federal Ministry of Defence. == References ==