The worlds of high finance and new media collided tonight at Radio City Music Hall as the popular business podcast Acquired hosted its only annual live show with a surprise guest who brought the sold-out crowd to its feet: JPMorgan Chase Chairman and CEO Jamie Dimon.

In a wide-ranging near hour long interview with hosts Ben Gilbert and David Rosenthal, Dimon, the longest-tenured CEO on Wall Street, offered candid insights into the strategy that has made JPMorgan the largest U.S. bank, his personal motivations, and the "secret sauce" that drives the financial giant.

Dimon explained the bank’s success through its "fortress" principle, emphasizing a portfolio of interconnected businesses. "All of our businesses feed each other. There’s no extraneous, we’ve gotten rid of everything that didn’t fit a strategy" he said, contrasting JPMorgan’s approach with competitors who diversified into less related areas like life insurance or truck leasing. "It’s hard for people to understand the risk in each one of these businesses when you’re spread so thinly."

He attributed the bank’s superior efficiency ratio, the metric showing it keeps about 15 cents more of every dollar in profit than its rivals, to relentless investment and a long-term perspective. "It is literally continuously investing and gaining business at the margin and not stopping," Dimon stated, adding that the company avoids chasing short-term gains by cutting investments in marketing, branches, or technology - but instead investing. "We kind of look right through the cycle," he said, before joking, "There's some secret sauce I'm not gonna tell you about."

The evening wasn’t just about business strategy. Dimon, who has led the bank since 2006 and navigated it through the 2008 financial crisis, spoke about why he remains in the role long after his contemporaries have retired.

"In my hierarchy of life, the most important thing is my family. Still is," he said. "The second thing is my country... And then my purpose is... this company. I can help cities, state schools, companies, employees, and I get the biggest kick out of that." He added, "As long as I have the energy, I'm gonna do it."

When pressed about potential future roles in public service, a topic of frequent speculation, Dimon acknowledged the possibility of a job that could have a bigger impact on the country than his current one, but he left the thought unfinished, drawing applause from the audience.

The star power wasn't limited to Dimon. Later in the evening, Gilbert and Rosenthal welcomed Meredith Kopit Levien, CEO of The New York Times Company, and media billionaire Barry Diller to the stage. The audience itself was a who's who of the business world, with former Starbucks CEO Howard Schultz spotted among the attendees.

For one night, the heart of the business world wasn’t on Wall Street, but on the stage at Radio City. The full podcast episode from this event is expected to be released later this summer.

For more like this on Forbes, The Legacy Banks Quietly Building The Future Of Finance and The 3 Innovation Challenges Keeping Bank CEOs Awake At Night.