AT the tender age of just 21, Ross Greer has become the youngest ever MSP.

But despite this, it seems the Green is already something of a political veteran, having been part of the successful campaign to give 16 and 17-year-olds the vote in the independence referendum.

He was 15 when he joined the Scottish Green Party and has also served as a member of the Scottish Youth Parliament, before contesting the East Dunbartonshire constituency in last May's general election.

READ MORE: Could the Greens hold balance of power at Holyrood?

He gained his new role as an MSP after being top of the Green list for the West of Scotland region.

In a post on the Scottish Young Greens website, he said: "I had always been an environmentalist since a young age but as my interest in politics grew, I began to realise that only the Scottish Green Party offered the practical solutions that I wanted, combining social justice and equality with sustainability and practical solutions to tackling climate change."

Mr Greer studied politics and psychology for a time at Strathclyde University but left in December 2012 to become Yes Scotland's communities co-ordinator for the independence referendum.

After the referendum he worked for the Scottish Greens on strategy development, and is the party's spokesman on Europe and external affairs.

The former Bearsden Academy student describes himself as being "Christian, socialist and Green".

READ MORE: Could the Greens hold balance of power at Holyrood?