Transcript of How an Interview DISASTER Became a HUGE Success for Diary of a CEO's Steven Bartlett (Extended)

Key takeaways

• CO2 levels above 400 ppm impair cognition like alcohol, and at 1,000 ppm you lose about 21% of cognitive capacity; the show's interview rooms reached 1,500 ppm, making the hosts feel "drunk".
• The interview experience is crafted using the peak‑end rule, deliberately making the ending especially strong so listeners remember the show more positively.
• Steven Bartlett started "The Diary of a CEO" in 2017 by recording under his kitchen stairs with a microphone bought at an Apple store, and the first episode only attracted 26 listeners.
• A research mix‑up caused Bartlett to interview the wrong guest, but the improvised conversation became one of the most downloaded episodes and taught him that good interviewing is about listening, not leading.
• The production team obsessively optimizes tiny details—music, scent, room CO2 levels—to improve comfort and performance for both host and guest.