Jo Swinson (pictured) steps down as Leader of the Liberal Democrats after losing her seat in the 2019 general election making her tenure the shortest in the party's history. Jo Swinson: Joanne Kate Swinson is a Scottish former politician who was Leader of the Liberal Democrats from July to December 2019. Swinson was Member of Parliament (MP) for East Dunbartonshire from 2005 to 2015 and 2017 to 2019. In September 2020, Swinson became Director of Partners for a New Economy (P4NE). December 13, 2019. Wiki link