She later studied at Cardiff University for a Master of Sciences in economics and later a PhD in Political Theory researching liberalism, communitarianism and multiculturalism.
[citation needed] Vice-President of Union whilst at College and Chair of Plaid Cymru Student Federation in 2003, Lansdown's political interests include community development, international relations and the environment.
[2] Lansdown was Chief Executive of Plaid Cymru between September 2007, replacing Dr Dafydd Trystan, and June 2011, when Rhuanedd Richards was appointed to the role.
[1][3] After the 2011 'Yes for Wales' referendum campaign, she resigned as Chief Executive of Plaid Cymru and as County Councillor for Riverside in order to move to Montgomeryshire with her new husband.
[citation needed] Since 2014, Gwenllian Lansdown Davies has been the Chief Executive of Mudiad Meithrin, which represents Welsh-medium childcare and early years providers and also delivers several Welsh-government funded projects relating to the transfer and use of the Welsh language in families.