Once hailed as the next Steve Jobs, Elizabeth Holmes became the world’s youngest self-made female billionaire after founding Theranos, a startup that promised to revolutionise healthcare with hundreds of blood tests from a single drop. BBC business editor Simon Jack and journalist Zing Tsjeng trace Elizabeth Holmes’s journey from precocious Stanford student to biotech entrepreneur, before unpacking how secrecy and hype masked a technology that couldn’t deliver. When Theranos collapsed spectacularly, a Silicon Valley dream became one of the biggest corporate scandals of the century.

Simon and Zing bring you a weekend listening recommendation: The Interface, the BBC's fiercely informed, fast and funny take on how tech is changing everything.

Hosted by three leading tech journalists whose work covers every aspect of the subject, each episode unpacks week-by-week the unfolding story of how technology is shaping all our futures. No guests. No jargon. Just three sharp voices debating the tech news stories that matter - whether they shook a government, broke the internet, or quietly tipped the balance of power.

As TikTok shifts geopolitics, Trump drives digital shockwaves, Elon Musk expands his space-internet empire and AI reroutes the routines of everyday life - the trio ask: what world are the tech titans building for us? And do we want to live in it?

If you’re in the UK, you can listen to The Interface on BBC Sounds. Everywhere else, find it on BBC.com or wherever you get your podcasts.

Peggy Cherng never set out to work in fast food, but her engineering mindset transformed how millions of Americans eat. Journalist Zing Tsjeng and BBC business editor Simon Jack trace Peggy Cherng’s journey: from electrical engineering and simulating battlefields, to co-founding Panda Express with her husband Andrew and becoming a billionaire. By applying data and rigorous standardisation, Peggy Cherng helped turn a single mall food-court experiment into the largest Chinese fast-food chain in the USA, with their orange chicken becoming a cultural staple.

How Ben Francis went from pizza delivery boy to the UK’s youngest billionaire, by founding sportswear brand Gymshark. BBC business editor Simon Jack and journalist Zing Tsjeng explore Ben Francis' remarkable rise: from sewing gym vests in his parents’ garage, to innovating in influencer culture. In Gymshark, Ben Francis created one of the fastest growing fitness brands in the world, with the ambition to take on athleisurewear giants like Nike and Adidas.

She skateboards to work, has a skydiving license, and was the world’s youngest self-made female billionaire. Journalist Zing Tsjeng and BBC Business Editor Simon Jack tell the story of Lucy Guo and trace her trajectory to becoming one of the tech titans. From dropping out of college to join Peter Thiel’s Fellowship, to couch-surfing as a millionaire, they follow Lucy Guo's journey to found Scale AI, a company that trains artificial intelligence for giants like OpenAI’s ChatGPT, Google, and Microsoft.

Good Bad Billionaire is the podcast that explores the lives of the super-rich and famous, tracking their wealth, philanthropy, business ethics, and success. There are leaders who made their money in Silicon Valley, on Wall Street and in high street fashion. From iconic celebrities and CEOs to titans of technology, the podcast unravels tales of fortune, power, economics, ambition and moral responsibility. Simon and Zing put their subjects to the test with a playful, totally unscientific scorecard — then hand the verdict over to you: are they good, bad, or simply billionaires?

Here's how to contact the team: email [email protected] or send a text or WhatsApp to +1 (917) 686-1176. Find out more about the show and read our privacy notice at www.bbcworldservice.com/goodbadbillionaire

It’s time to hear what you, our listeners, think of Elon Musk. Journalist Zing Tsjeng and BBC business editor Simon Jack read your feedback to our Elon Musk episode: do you think he’s good, bad, or just another billionaire?

David Geffen is the money man behind Crosby, Stills and Nash, Guns N' Roses, Cher, Shrek, Gladiator, and even Cats the musical. Journalist Zing Tsjeng and BBC business editor Simon Jack tell the remarkable story of the Brooklyn boy who conquered Hollywood and became an entertainment mogul. From starting in a New York agency mailroom to the heart of Laurel Canyon’s hippie-rock scene, David Geffen rubbed shoulders with almost every major cultural figure of the 20th century. Joni Mitchel wrote a song about him, and Cher dated him. Then he moved from the music industry to movies, founding DreamWorks with Steven Spielberg and building one of the world’s most valuable art collections.

Sara Blakely grew up in Florida and dreamed of becoming a lawyer, but after failing the LSAT twice, she pivoted to sales and later entrepreneurship. Frustrated by uncomfortable hosiery, Blakely cut the feet off her tights and sparked an idea that would change fashion. With no formal business training, she cold-called hosiery mills and landed her first big break with Neiman Marcus, then with the Oprah Winfrey show. Spanx went from a scrappy startup to a billion-dollar brand that reshaped celebrity style and became a cultural phenomenon.

Journalists Zing Tsjeng and Simon Jack trace Sara Blakely's journey from selling fax machines to building Spanx into a global empire. They explore how she leveraged persistence, marketing, and risk-taking to disrupt an industry dominated by men - and what her story reveals about innovation, branding, and entrepreneurship.

Good Bad Billionaire is the podcast from the BBC World Service that explores the lives of the super-rich and famous, tracking their wealth, philanthropy, business ethics and success. There are business leaders who made their money in Silicon Valley, on Wall Street and in high street fashion. From iconic celebrities and CEOs to titans of technology, the podcast unravels tales of fortune, power, economics, ambition and moral responsibility. Simon and Zing put their subjects to the test with a playful, totally unscientific scorecard — then hand the verdict over to you: are they good, bad, or simply billionaires?

To contact the team, email [email protected] or send a text or WhatsApp to +1 (917) 686-1176. Find out more about the show and read our privacy notice at www.bbcworldservice.com/goodbadbillionaire

Guy Laliberté went from busking on the streets of Quebec to entertaining Hollywood celebrities and wearing a clown nose on the International Space Station. BBC business editor Simon Jack and journalist Zing Tsjeng tell the story of the Cirque du Soleil founder, and how he turned his passion for parties into a billion-dollar entertainment empire.

Elon Musk’s extraordinary rise, from a troubled childhood in apartheid-era South Africa to becoming the first person to amass half a trillion dollars.

BBC business editor Simon Jack and journalist Zing Tsjeng chart Elon Musk's journey to becoming a multi-billionaire entrepreneur: from tech giant PayPal, to revolutionising electric cars at Tesla, and launching rockets at SpaceX. But becoming the richest person in the world comes with plenty of boardroom drama and controversy.

Good Bad Billionaire is the podcast that explores the lives of the super-rich and famous, tracking their wealth, philanthropy, business ethics and success. There are leaders who made their money in Silicon Valley, on Wall Street and in high street fashion. From iconic celebrities and CEOs to titans of technology, the podcast unravels tales of fortune, power, economics, ambition and moral responsibility. Simon and Zing put their subjects to the test with a playful, totally unscientific scorecard — then hand the verdict over to you: are they good, bad, or simply billionaires?

We're taking a break over the next few weeks but we'll be back in the New Year with a host of new billionaires. You can still contact the team: email [email protected] or send a text or WhatsApp to +1 (917) 686-1176. Find out more about the show and read our privacy notice at www.bbcworldservice.com/goodbadbillionaire