At just 39, Lib Dem leader is both the first woman and youngest person to ever holdthe position.
Born in Scotland, she was first elected to a become an MP in 2005, when she beat Labour’s John Lyons.
Not one to shy away from controversial topics, Swinson was vocal in her opposition to the Iraq War and the introduction of national identity cards.
Swinson supports measures to help tackle climate change and the conservation of energy but in 2015 she lost her East Dunbartonshire seat to the SNP.
However, she was back in the House of Commons in 2017 and was elected to Party leader in May this year.
She is one of five Party leaders going head to head in a televised debate at 7pm tonight on BBC One.
Swinson will spend 30 minutes answering audience questions in the programme hosted by Fiona Bruce.
Swinson has held several senior positions within the Liberal Democrats, including Equalities Minister, and served as Nick Clegg’s Parliametary Private Secretary when he was Deputy Prime Minister.
Passionate about health care and environmental issues, Swinson has good reason to want to protect the NHS.
Back in 2013 the Lib Dem leader, who has a peanut allergy, almost died when she had a reaction to eating a biscuit.
She accidentally ate the snack, unaware it contained nuts, at a charity sale and went into anaphylactic shock.
As she struggled from breath, doctors gave her adrenaline and she had to be treated in hospital.
Swinson said at the time: “Almost instantly I felt a tingling sensation so I knew I had unknowingly eaten a nut.
“It’s difficult to always know whether something contains nuts or not – and this time I got it wrong.”
The MP was rushed to Southern General Hospital in Glasgow by her mum, where she was injected with an Epipen.
Ever prepared, Swinson had already written out what to do in case her throat became so swollen that she couldn’t speak.
Medics gave her steroid and oxygen and she was allowed home the following day.
Swinson said: “It was a very scary experience. Lukcily, once you get the right treatment you recover very quickly from it – but the bottom line is that you don’t get help, you can die.”
Another cause close to the politician’s heart is unneccesary plastic packaging.
She has campaigned specifically for Easter egg manufacturers to reduce the amount of plastic used each year.
Swinson, releasing a report into why firms need to do more to cut down on the amount of plasticthey use, said: “Millions of us watched Blue Planet and witnessed the shocking levels of plastic waste in our oceans.
“None of us want the packaging from our tasty Easter treats to contribute to ocean pollution.
“It is disappointing that Easter Egg manufacturers have not been more proactive in reducing levels of plastic in their packaging, so I am calling on them to pledge to eliminate plastic in next year’s Easter Eggs.
“If manufacturers truly want to cut the use of plastics they must sacrifice the presentation of their Eggs for the presentation of their values.
“The plastic waste associated with Easter eggs is symptomatic of a much wider problem across consumer industries, where companies could and should be doing more to combat plastic waste.
“Our oceans are precious – we all need to do our bit to help preserve them.”