Jacinda Ardern is arguably the most globally famous and lauded New Zealand Prime Minister of modern times.

Her international profile began with her being the world's youngest head of government at thirty seven, who within months had a baby and took it all in her stride.

But it was her response to the horrific terrorist attack on mosques in Christchurch that gave her hero status amongst progressives around the world - embracing the muslim community in New Zealand and passing strict gun laws in response.

Her six years as prime minister also meant dealing with the covid pandemic, and the fury and conspiracy theories around lockdowns and vaccines that came with it - many of which targeted her personally. And then in January 2023 - as suddenly as she had arrived on the global stage, she stood down. Her book, A Different Kind of Power, is perhaps the most sensitive and candid account of a leader you could ask for, framed around her desire to be remembered for her kindness.

Whilst life expectancy is declining in the UK and America and other high-income countries, some tech billionaires have become obsessed with life longevity - but which factors really impact how long we live and when we die?

Public health expert Devi Sridhar speaks to Krishnan Guru-Murthy on Ways to Change the World about the launch of her new book 'How not to die (Too Soon).

She explains how changing our public health policy could improve life expectancy, what the UK can learn from other countries when it comes to health, and what her own cancer diagnosis taught her about the state of the NHS’ waiting list times.

Once described as the 'comedian's comedian' Stewart Lee has been performing stand up since 1988.

He is known for pushing boundaries with his intelligent, self-referential and often provocative style of comedy but in his new show 'Stewart Lee vs the Man Wulf' he questions his place on the comedy circuit in an era of increasing populism rhetoric and the popularity of, in his words “$60m Netflix comedians of hate.”

In this episode of Ways to Change the World with Krishnan Guru-Murthy he discusses the state of comedy today and what he thinks of the comedy style of comics like Ricky Gervais and Dave Chappelle as well as why he wouldn't tour America right now.

As The Observer, the world's oldest Sunday newspaper begins a new era under Tortoise media he also reflects on his column for the paper which he's stopped after 15 years.

Produced by Holly Snelling and Sachin Croker

Newly appointed National Theatre Director Indhu Rubasingham becomes the first woman and person of colour to lead the theatre in it's 60 year history.

She sat down with Krishnan Guru-Murthy to discuss art, diversity and censorship and taking on her 'dream job.'

Produced by Holly Snelling and Vik Patel.

Joanna Moncrieff is a British psychiatrist, author and researcher who is a prominent and controversial voice in the research of depression.

Her 2002 study ‘The Serotonin Theory of Depression: A Systematic Umbrella Review of the Evidence’ concluded that there was no link between serotonin and depression, debunking the mainstream medical belief in antidepressants.

Moncrieff, whose research has drawn criticism from ‘Big pharma’ and support from fringe figures on the right, speaks to Krishnan Guru-Murthy in the latest episode of Ways to Change the World.

Produced by Silvia Maresca, Ka Yee Mak and Tom Gordon-Martin.

Pia Sinha worked in prisons for 24 years before being appointed CEO of the charity Prison Reform Trust and she describes herself as a "ridiculously optimistic" person, who believes the prisons can be made to work properly.

Sinha started her career in prison as a psychologist and went on to work in female, male prisons and institutions for young offenders. She was the governor at three prisons and later was responsible for all the women’s prisons in the country.

Sinha, who believes many of the prisoners in the UK should not be behind bars, speaks to Krishnan Guru-Murthy in the latest episode of Ways to Change the World.

Produced by Silvia Maresca, Ka Yee Mak and Tom Gordon-Martin.

Sustainability expert and professor Mike Berners-Lee argues that dishonesty in politics, business, and the media is one of the biggest barriers to tackling global crises like climate change, social inequality, and environmental destruction.

In this episode of Ways to Change the World, he talks to Krishnan Guru-Murthy about the need for a cultural shift where honesty is valued, and where deceit in public life carries real consequences. Without this, he warns, we risk making the world's biggest challenges even harder to solve.

Produced by Silvia Maresca, Ka Yee Mak, Tom Gordon-Martin.

Entrepreneur, investor, and former Dragon’s Den star Sara Davies has spent 20 years building businesses and helping others do the same. She started her company, Crafter’s Companion, while still at university and turned it into a global brand. But as she tells Krishnan Guru-Murthy, success isn’t just about strategy - it’s about mindset.

It’s a theme she explores in her latest book, The Six-Minute Entrepreneur, which distills the lessons of her own journey into advice for anyone looking to succeed.

In this episode of Ways to Change the World, she reflects on the challenges facing small businesses, what she’s learned from Dragon’s Den, and why the UK needs to celebrate its entrepreneurs more. As she steps away from the Den, she also shares what’s next for her and why she remains deeply passionate about backing businesses that make a difference.

Produced by Silvia Maresca and Ka Yee Mak.