Whitmore has worked in both local and international ecology and environmentalism as well as with the Government of New South Wales, Australia. In 2015, she founded the East Wicklow Rivers Trust.[citation needed]
She was elected to represent the Greystones local electoral area on the Wicklow County Council, following the 2014 local elections. In July 2015, she helped co-found the Social Democrats as a party and became the party's Spokesperson for Children.[5]
Whitmore was elected as a Social Democrat TD for the Wicklow constituency following the 2020 general election. In the election, she came ahead of former Social Democrats TD and leader Stephen Donnelly who left the party after just one year, citing difficulties in cooperating with the other leaders.[6]
In September 2021, Whitmore tabled a Just Transition Bill in the Dáil; the Bill was deliberately almost identical to one the Green Party had tabled in 2017 while in opposition but had been voted down. At the time, Green leader Eamon Ryan called their proposed bill a "critical piece of the architecture" of any policy on climate action.[7] One amendment Whitmore did make however was to define the term "Just Transition", as the previous version of the bill did not. Whitmore said the bill would define "just transition" as a green transition that ensures the economic and social consequences of the climate emergency are managed to maximise "opportunities of decent work for all, reduce inequalities, promote social justice, and support industries, workers and communities negatively affected".[7][8]
^"About". Jennifer Whitmore. Archived from the original on 23 September 2021. Retrieved 10 February 2020.
^"Whitmore will be candidate in the next General Election". Bray People. 22 September 2017. Archived from the original on 2 May 2021. Retrieved 11 February 2020. Cllr Whitmore is a founding member of the Social Democrats and has represented the people of the Greystones Municipal District as a councillor since 2014.