Simon Thomas was the Plaid Cymru MP for Ceredigion during 2000 and 2005 successfully holding the constituency in a by-election and general election before losing narrowly by just 219 votes.
He spoke in Parliament for his party on Environment, Food and Rural Affairs, Transport, International Development, Energy, and Culture, Media and Sport.
Simon joined the Environmental Audit Committee immediately on his election in 2000 and become one of the longest-serving members of that body, being recognised as a constant Parliamentary advocate for the environment and sustainable development.
Before being elected as MP Simon worked as a rural development manager with Jigso. He has also worked as an anti-poverty officer, and as a researcher for Taff Ely Borough Council. He was a Ceredigion county councillor for a year before his election.
Simon has previously served as Plaid's Director of Policy and Research and has played a significant role in the development of Plaid's policies over recent years.
Following the 2005 election, he was employed as the Development Manager for Technium Pembrokeshire, focusing on energy issues.
For the last thee years he has been a Senior Special Advisor to the Welsh Government, advising the Deputy First Minister and the other Plaid Cymru Ministers and helping to deliver the One Wales programme. He was elected in 2011 as AM for Mid and West Wales.
Simon lives in Aberystwyth with his wife and two children.