Kirsty Young's castaway is the writer, feminist & activist, Gloria Steinem.

At the forefront of the second wave of feminism, she came to prominence after publishing an article entitled "After Black Power, Women's Liberation" in 1969. Two years later she co-founded the feminist magazine Ms. As an activist, she has spent much of her life travelling, giving talks and lecturing.

Born in 1934 in Ohio, her father was a businessman who ran a lake-side resort in the summer and packed up his family at the first sign of frost to travel cross-country in a caravan selling antiques. Her mother had been a newspaper journalist and later suffered a nervous breakdown before Gloria was born. She became her mother's sole carer aged eleven when her parents divorced. It was only following their separation, having settled down in a house in Toledo, that she spent her first full year at school.

After high school, she read politics and government and then traveled around India for two years on a fellowship. On her return, she established herself as a writer in 1960s New York and co-founded Ms. magazine in 1971. Since then, her writing has appeared in innumerable magazines, newspapers, anthologies, television commentaries, political campaigns, and film documentaries in America and internationally. In 2013 she was awarded a Presidential Medal of Freedom, the United States' highest honour, by Barack Obama.

Producer: Cathy Drysdale.

Kirsty Young's castaway is the artist Yinka Shonibare MBE.

His work has populated museums around the globe, with a vivid, subversive and often tragi-comic presence; exploring themes of cultural identity, post colonialism and the impact of globalisation. A Turner Prize nominee in 2004, he has exhibited at the Venice Biennial and internationally.

His 'Nelson's Ship in a Bottle' became his first public art commission when it was one of the art works chosen for the Fourth Plinth in London's Trafalgar Square.

Born in London, his parents moved the family back to Nigeria when he was three. Later he returned to Britain to finish his education but his plans to study art were brutally interrupted when he was 19 contracted the disease, Transverse Myelitis, which attacked his central nervous system and rendered him paralysed from the neck down. He had three years of intensive rehabilitation before beginning again at art school.

He went on to study at Goldsmiths and was part of the Young British Artist generation.

Producer: Sarah Taylor.

Kirsty Young's castaway is the engineer and nuclear scientist Dr Dame Sue Ion.

The first woman to be awarded the highly prestigious President's Medal by the Royal Academy of Engineering, she has worked her way to the heart of an industry that remains very contentious.

Her passion for understanding how and why the world works the way it does first began as she tinkered for hours at her parents' kitchen table with a little chemistry set.

Today she goes into schools to encourage more girls to take up engineering and her enthusiasm for the subject has galvanised many to take up the discipline.

Producer: Paula McGinley.

Kirsty Young's castaway is Hugh Bonneville.

Known around the world for his portrayal of Lord Grantham in ITV's hugely popular Downton Abbey, he made British audiences laugh with his portrayal of the hapless Ian Fletcher in the BBC comedies Twenty Twelve and W1A and charmed audiences of all ages as Mr Brown in the animated film, Paddington Bear.

His immense range as an actor has ensured he's seldom been out of work since joining the National Theatre in 1987, but his thespian leanings started much earlier - writing, performing & even creating tickets for his very own dramatic productions - performed for his family at home. He was born in London to a surgeon and a former nurse and grew up with two older siblings. At junior school he refused to let a teacher put him off his passion for acting which he continued to pursue while doing a degree in Theology at Cambridge.

He chose an acting career over law, and following a brief time at drama school, his first professional role was "bashing a cymbal" in A Midsummer Night's Dream at London's Regent's Park theatre in 1986. He joined the National the following year and achieved his ambition of being a member of the Royal Shakespeare Company in 1991. His television debut was as a conman in the ITV drama Chancer and his first appearance on the big screen was in Mary Shelley's Frankenstein, directed by Kenneth Branagh. He appeared opposite George Clooney in the 2014 film The Monuments Men and was the voice of Father Christmas in the BBC's adaptation of the Julia Donaldson picture book Stick Man.

Producer: Cathy Drysdale.

Kirsty Young's castaway is the architect, Dame Zaha Hadid.

The first woman to be awarded architecture's highest honour, the Pritzker Prize, she designed the Aquatic Centre for London 2012, Glasgow's Riverside Museum and has twice won the Stirling Prize - first for the MAXXI museum in Rome and secondly for her design for the Grace Academy school in Brixton, London. She recently became the first woman in her own right to receive the RIBA Gold Medal.

She was born in Baghdad in 1950 where her father was a prominent member of the opposition National Democratic Party. After attending school there, she travelled to Switzerland and England to boarding school before returning to London in 1972 to study at the Architectural Association.

In 1983 she won her first competition to design the Peak Leisure Club in Hong Kong. It gained her international recognition though it was never built: her first building was the Vitra Fire Station in Germany in 1993. In the late 1990s she built a contemporary arts centre in Cincinnati & a BMW car manufacturing plant in Leipzig. She won competitions to design a new opera house in Cardiff but it was never realised and her first permanent building in Britain was a Maggie's Cancer Care Centre in Scotland built in 2006. She has designed stations for the Nordpark Cable Railway in Innsbruck, Austria and in 2010 the Opera House in Guangzhou, China. In 2014 she became the first woman to win the Design Museum's Design of the Year Award for the Heydar Aliyev Cultural Centre, in Baku, Azerbaijan.

She was made a Dame in 2012 for services to architecture.

Producer: Cathy Drysdale.

Kirsty Young's castaway is the polar adventurer Ben Saunders. In his own words he "specialises in dragging heavy things around cold places".

He's one of only three people to have skied solo to The North Pole and he holds the record for the longest solo Arctic journey ever on foot.

After traversing Russia and the frozen crust of the Arctic Ocean, his most recent adventure was to triumph where, a century before, Captain Scott and his men failed. Ben successfully retraced that ill-fated Terra Nova route by making the eighteen hundred mile journey through Antarctica-and-back, entirely on foot.

When he's not wrapped up somewhere cold, he is a motivational speaker.

Producer: Sarah Taylor.

Kirsty Young's castaway is Professor Dame Carol Black.

She is Principal of Newnham College, Cambridge, and is a special adviser to the Department of Health and Public Health England. She is also Chair of the Board of the Nuffield Trust, the health policy think tank.

She read History at Bristol University before beginning her medical career with encouragement from Dame Cecily Saunders, the founder of the hospice movement. She was Head of Rheumatology at London's Royal Free Hospital from 1989-1994, and was Medical Director of the hospital between 1995 and 2002. She's an international expert on scleroderma, a skin and tissue auto-immune disease, and is the second woman to become President of the Royal College of Physicians.

She was made a Dame in 2005 for her services to Medicine.

Producer: Cathy Drysdale.

Kirsty Young's castaway is Bill Gates.

He sat at his first computer while still at school in Seattle, wrote his first computer programme aged just 13 and went on to co-found the company Microsoft, becoming one of the key figures of the technological revolution. In 2000, he and his wife, Melinda, launched the Bill and Melinda Gates Foundation which has given to date over $34 billion to projects aimed at reducing health inequality around the world.

Born into a professional family - his father was a lawyer, his mother a former teacher who later became involved with volunteer work - he was introduced to the idea of 'giving back' at an early age. An avid reader as a child, he attended Harvard where in his sophomore year he and Paul Allen developed software for the first micro-computers. The company would go on to achieve huge success with its Windows operating system.

By 1987, Gates had become the world's youngest self-made billionaire, then worth $1.25 billion. Consistently listed as the Richest Man in the World, he stepped down as CEO of the company in 2000 although he remained as Chairman until 2014.

These days his primary focus is his philanthropy. In 2010, Gates and his friend Warren Buffett announced the Giving Pledge which aims to inspire the wealthy people of the world to give away the majority of their net worth to worthy causes.

Producer: Cathy Drysdale.

Kirsty Young's castaway is the philanthropist and publisher Sigrid Rausing.

Founder of one of the UK's largest philanthropic foundations, her trust has given away around £230m to human rights causes since it began.

Brought up in Sweden, she is currently the publisher of Granta Books and the editor of Granta Magazine and her work spotting and developing new writers stems from her lifelong love of literature.

As the granddaughter of Ruben Rausing, who founded food packaging company Tetra Pak, she is a member of one of Britain's richest families. Her interest in human rights was sparked as a child by a love of animals and hearing her parents talk about the Holocaust.

Producer: Paula McGinley.

Kirsty Young's castaway is the educationalist and writer, Sir Anthony Seldon.

Now Vice-Chancellor of Buckingham University, he was the Master of Wellington College. He has written, co-written and edited more than 30 books, including political biographies of Prime Ministers Churchill, Blair, Brown and Cameron.

He had to take his 'A' levels twice before going on to read PPE at Oxford and doing a PhD at the LSE, before embarking on his teaching career. His first headmaster job was at Brighton College and then he went onto be Master of Wellington College. During his tenure, the school became co-educational, set up partner schools in China, and introduced a more holistic approach to learning with happiness classes and stillness sessions added to the curriculum and in 2009 the state secondary Wellington Academy was founded in Wiltshire.

He is a fellow of the Royal Historical Society and of the Royal Society of Arts and in 2014 was knighted for services to education and modern political history.

Producer: Cathy Drysdale.