Mr Sundqvist has been a politician since 1979 during which time he has also worked for the Swedish Social Insurance Agency.

Since the general election of 2018, Mr Sundqvist is the Mayor of Jönköping municipality, Sweden.

The City of Jönköping won the 2021 Access City Award, which is organised by the European Commission together with the European Disability Forum, and is one of the actions of the EU Disability Strategy 2010-2020.