Andrew Copson is is Chief Executive of Humanists UK and author of Oxford University Press' Very Short Introduction to Secularism. He speaks to Alex about the meaning of secularism, its distinction from humanism, liberalism and atheism, and how it might be achieved.

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Anthony Magnabosco is the founder and executive director of Street Epistemology International, a non-profit organisation formed to encourage critical thinking and scepticism while providing people around the world with the resources needed to develop and promote Street Epistemology. He speaks to Alex about how to get people to rethink their beliefs and discard of falsities they might hold to.

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Peter Singer is an Australian moral philosopher and author of the seminal Animal Liberation, a book credited with initiating the modern animal rights movement. He speaks to Alex about utilitarianism and how we might apply it to all sentient creatures.

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Justin Brierley is the host of the popular radio show 'Unbelievable?' which platforms debates between Christians and non-Christians. He is the author of 'Unbelievable: Why, After Ten Years of Talking With Atheists, I’m Still a Christian'. He speaks to Alex about his reasons for retaining his faith, and the nature of reason.

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Matt Dillahunty is an American atheist activist, former president of the Atheist Community of Austin, and host of The Atheist Experience. He is a magician, public speaker, and debater, having shared stages with the likes of Richard Dawkins, Jordan Peterson, and Sam Harris. In this episode of the Cosmic Skeptic Podcast, Matt speaks to Alex about his meta-ethical framework, before discussing veganism at length, something he has never done in this format before.

Dr Michael Shermer is an American historian of science, editor-in-chief of Skeptic magazine, and author of nearly 20 books, including Heavens On Earth, The Moral Arc, and Why People Believe Weird Things. He speaks to Alex about how we should respond to the inevitability of death, and why we shouldn't be afraid of it.

Armin Navabi is an Iranian Canadian ex-Muslim and secular activist, author, podcaster, and founder of Atheist Republic. He speaks to Alex about the troubles he faces spreading his secular message and how to find meaning in a world without God.