She is a member of the Green Party and served as one of its spokespersons along with Gustav Fridolin between 2011 and 2016.

In 2012, Romson completed a doctorate in environmental law at Stockholm University.

[2] On 29 March 2011, she was nominated as one of the candidates[3] to be the Green Party's new spokesperson, together with Gustav Fridolin.

[4] In October 2014, Romson used an outlawed type of paint on the bottom of the boat she lives on.

[5] On 19 April 2016, she described the September 11 attacks on the World Trade Center as "olycka" (meaning "accident", "disaster" or "misfortune" depending on context).