John Arnold built his fortune in energy trading by surrounding himself with smart people, maintaining emotional detachment, sensing market imbalances through first-principles analysis, and focusing with laser intensity on a single niche until he dominated it completely. Now he's applying that same analytical rigor to philanthropy, where he's discovered that changing human behavior for the long term proves far more challenging than predicting natural gas prices, and that the academic research meant to guide social policy is often riddled with perverse incentives and poor methodology.

Tyler and John discuss his shift from trading to philanthropy and more, including the specific traits that separate great traders from good ones, the tradeoffs of following an "inch wide, mile deep" trading philosophy, why he attended Vanderbilt, the talent culture at Enron, the growth in solar, the problem with Mexico’s energy system, where Canada’s energy exports will go, the hurdles to next-gen nuclear, how to fix America’s tripartite energy grid, how we’ll power new data centers, what’s best about living in Houston, his approach to collecting art, why trading’s easier than philanthropy, how he’d fix tax the US tax code and primary system, and what Arnold Ventures is focusing on next.

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Recorded April 28th, 2025.

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Get tickets to the CWT live show at 92NY with David Brooks!

Theodore Schwartz stands at the pinnacle of neurosurgical expertise. With over 500 published articles, 200 pieces of commentary, and 5 patents to his name—effectively producing a scholarly work every two weeks for three decades—Schwartz spent most of his career at Weill Cornell Medicine, where he pioneered new minimally-invasive surgical techniques and led the Epilepsy Research Laboratory, among many (many) other things. His recent book Gray Matters: A Biography of Brain Surgery offers readers an insider's view of one of medicine's most demanding specialties.

Tyler and Ted discuss how the training for a neurosurgeon could be shortened, the institutional factors preventing AI from helping more in neurosurgery, how to pick a good neurosurgeon, the physical and mental demands of the job, why so few women are currently in the field, whether the brain presents the ultimate bottleneck to radical life extension, why he thinks free will is an illusion, the success of deep brain stimulation as a treatment for neurological conditions, the promise of brain-computer interfaces, what studying epilepsy taught him about human behavior, the biggest bottleneck limiting progress in brain surgery, why he thinks Lee Harvey Oswald acted alone, the Ted Schwartz production function, the new company he’s starting, and much more.

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Recorded January 31st, 2025.

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Few understand both the promise and limitations of artificial general intelligence better than Jack Clark, co-founder of Anthropic. With a background in journalism and the humanities that sets him apart in Silicon Valley, Clark offers a refreshingly sober assessment of AI's economic impact—predicting growth of 3-5% rather than the 20-30% touted by techno-optimists—based on his firsthand experience of repeatedly underestimating AI progress while still recognizing the physical world's resistance to digital transformation.

In this conversation, Jack and Tyler explore which parts of the economy AGI will affect last, where AI will encounter the strongest legal obstacles, the prospect of AI teddy bears, what AI means for the economics of journalism, how competitive the LLM sector will become, why he’s relatively bearish on AI-fueled economic growth, how AI will change American cities, what we'll do with abundant compute, how the law should handle autonomous AI agents, whether we’re entering the age of manager nerds, AI consciousness, when we'll be able to speak directly to dolphins, AI and national sovereignty, how the UK and Singapore might position themselves as AI hubs, what Clark hopes to learn next, and much more.

Read a full transcript enhanced with helpful links, or watch the full video.

Recorded March 28th, 2025.

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