From 1988 to 1990 Arnold was a project manager at the
Centre for European Policy Studies in
Brussels, focusing on environmental and agricultural policies. In July 2013 Arnold partnered with
Deutsche Bahn to recruit African refugees to work for the railway. The partnership caused controversy, and Deutsche Bahn later replaced the refugees with their own employees. Arnold continued his commitment to find work for refugees in Germany, employing 60 asylum seekers to help with the State Garden Show in 2014 and later with the
Festival Europäische Kirchenmusik. Arnold called for political reform in the issue of
accepting refugees into the country, and advocates for integrating refugees into city life. In 2016 Arnold was considered as a possible candidate in the
election for the
Minister-President of Baden-Württemberg. He declined to run for the office of Minister-President, instead announcing he would seak re-election as Lord Mayor of Schwäbisch Gmünd in October of that year. He was reelected to the office on 7 May 2017 with 85 percent of the vote and a voter turnout of 36.05 percent. In February 2020 Arnold was considered as a top candidate for the Christian Democratic Union in the mayor election for
Stuttgart but ultimately decided to decline the party's offer. Upon announcing his intentions to keep his office as Lord Mayor, he received a standing ovation from the town's council. In July 2020 Arnold met with
Sir Stephen Houghton, a British government official and head of the
Barnsley Metropolitan Borough Council, via
video conferences to offer support and advice for handling the
COVID-19 pandemic. On 21 July 2020 Arnold, along with
Boris Palmer and
Matthias Klopfer, wrote a letter to Baden-Württemberg Minister-President
Winfried Kretschmann and Minister of the Interior
Thomas Strobl about riots affecting their towns. == Personal life ==