Michael Edward Woodin was the Principal Speaker of the Green Party of England and Wales and a city councillor for Oxford from 1994 to 2004. He was Principal Speaker for six of the eight years between 1998 and 2004, firstly alongside Jean Lambert before her election as an MEP, then alongside Margaret Wright, and lastly with Caroline Lucas MEP.

The Leader of the Green Party of England and Wales is the most senior political figure within the Green Party of England and Wales. The role was introduced alongside that of deputy leader in 2008. Prior to this, the party's public spokespersons were principal speakers. There were two principal speakers, one female and one male, who were elected annually at the Green Party's Autumn Conference and held no vote on the Green Party Executive (GPEx).